JPS5945782B2 - Method and device for measuring entangled parts of interlaced yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring interlaced yarns, that is, entangled portions of interlaced yarns.

For interlaced yarns, an important quality characteristic is the number of interlaced parts per unit length of the yarn, that is, the degree of interlacing, or the cohesion factor determined from the average yarn length between the interlaced parts.

As a conventional method for measuring such characteristics, the ``hook-drop method'' has generally been adopted. This "hook drop method" involves inserting a stylus into the thread, moving the thread or the stylus, and detecting the intertwined part by the force or displacement that the stylus receives as it passes through the intertwined part. This is to measure characteristics such as the degree of entanglement. A device that automated this "hook-drop method" was published in U.S. Patent No. 32.
No. 90932. However, in this "hook drop method", based on the measurement principle described above, in order to reliably detect the intertwined part of the yarn, it is necessary to reduce the traveling speed of the yarn or the stylus, resulting in poor measurement efficiency. There is a problem.

For example, the running speed is usually measured at 5 m/Mm or less, and it takes more than 1 minute to process a sample yarn length of 5 to 10 m.

Therefore, it is an object of the present invention to provide a method for measuring the entangled portions of interlaced yarns, which is an alternative to the "hook drop method" and has good measurement efficiency.

In order to achieve this objective, the inventors of the present invention have conducted extensive research and have come up with a new method for measuring the entangled portions of interlaced yarns, which significantly improves measurement efficiency compared to the conventional "hook drop method".

According to the present invention, when running an interlaced yarn and measuring the entangled portion of the yarn, a shape change in the width direction is caused at least in the non-entangled portion of the yarn, and the interlaced portion is not entangled. The yarn is caused to run in contact with a contact member under a predetermined tension in a range where the stranded state is maintained to cause the yarn to undergo the shape change, and the intertwined portion of the yarn is detected based on the shape change. A first invention is a method for measuring intertwined portions of an interlace yarn, which is characterized by the above-described features, and a second invention is an apparatus for measuring intertwined portions of an interlace yarn for carrying out the first invention. The present invention will be explained below with reference to the drawings based on specific examples.

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a detailed diagram of a confounding portion detection section of the embodiment, and FIG. 3 is an explanatory diagram of output signal processing of the detection section.

As shown in FIG. 1, yarn Y to be measured.

is taken from the yarn package 1 inserted into the bobbin holder 2 via the yarn guide 3, tension adjustment device 4, tension detector 5, and intertwined portion detection section 10 at a predetermined speed by the take-up machine 7. The yarn Y. A predetermined tension is applied to by the tension adjustment device 4. As such a tension adjustment device 4, a well-known tension roll system or the like can be applied. Further, the tension is detected by the tension detector 5 and measured by the measuring device main body 20.
The tension indicator 21 provided at the tension indicator 21 enables monitoring. Yarn guides 6 are provided before and after the tension detector 5 to form a predetermined yarn guide and ensure stability in tension measurement. As shown in detail in FIG. 2, the intertwined portion detection unit 10 includes a contact member 11 made of a light-transmitting material such as glass and having an arc-shaped cross section, and a contact member 11 configured to guide a predetermined thread to the contact member 11. It is comprised of four guides 12 for guiding the yarn, a light source 14 and a light receiving device 13 provided at positions corresponding to the welded portions of the contact member 11 with the contact member 11 in between.

As shown in FIG. 1, the light source 14 has a measuring instrument body 20
Power is supplied from a DC voltage constant device 22 provided in the measuring instrument body 20, and the output of the light receiving device 13 is connected to a pulse counter 23 provided in the main body 20 of the measuring instrument. First, a method for measuring intertwined portions of interlaced yarn, which is the first invention of the present invention, will be explained using the embodiments having the above configuration.

As shown in FIG. 2, the yarn Y to be measured.

is caused to run in contact with the welding surface of the contact member 11 at a predetermined position of the contact member 11 by the guide 12. and the running yarn Y. Then, a predetermined tension is applied by the tension adjustment device 4. That is, the thread YO is caused to run in contact with the welding surface of the contact member 11 under a predetermined tension. By the way, in such a case, if the tension is set to a value within an appropriate range, the yarn Y will be formed as shown in FIG. 2a. The part with little or no entanglement, that is, the non-entangled part, changes shape into a ribbon-like Y1, while the yarn Y. It has been found that the highly entangled portion of the interlaced yarn, that is, the entangled portion of the interlaced yarn, runs through the spliced yarn portion in an entangled state without changing its shape into a ribbon shape. The reason why the shape of the interlace yarn changes when it is caused to run in contact with the contact member 11 under a predetermined tension is considered to be as follows. That is, when the interlaced yarn is made to run in contact with the contact member 11 under a predetermined tension, the interlaced yarn has a direction perpendicular to the running direction of the yarn within the plane regulated by the tangent surface of the contact member 11. A force is generated that causes the single fibers to align horizontally. However, since the interlace yarn has entanglements between the single fibers, the shape of the interlace yarn changes into the ribbon shape depending on whether the force is greater than the force required to untangle the single fibers. It is thought that it will be decided whether or not. In other words, in the non-entangled part, there is less entanglement between single fibers, so the entanglement can be unraveled with a small force, whereas in the entangled part, there is more entanglement, so it is thought that a large force is required to untie the fibers. It is believed that the shape change occurs if the tension is set appropriately.
Therefore, the predetermined tension according to the present invention means a tension within a range that causes the unentangled portion to change its shape and maintains the intertwined state in the entangled portion, as described above. The value of this tension varies depending on the degree of entanglement, fineness, thickness, etc. of the yarn, but in the inventors' study, a good correspondence with the degree of entanglement obtained by the "hook drop method" was obtained in the range of 5 to 10 gr. . by the way,
In this embodiment, the shape of the contact member 11 is shown as having a tangent surface with a circular cross section in the thread running direction, but as explained above, the shape of the contact member 11 is not limited to this embodiment. It is clear from this.

That is, in the present invention, the contact member 11 may have any shape as long as the contact member 11 has a shape that allows the single fibers of the yarn to be effectively spread by yarn tension in a direction perpendicular to the yarn running direction, that is, in the width direction on the contact member 11. It can also be a shape. As such a shape, it is preferable that the connecting member 11 has a convex welding portion in the cross section in the thread running direction. The number of such convex portions is not necessarily limited to one, and a plurality of such convex portions may be provided at appropriate intervals. As is clear from the above explanation, the thread Y.

Since the shape change occurs as a change in the width direction, it is clear from the above description that it can be measured by various measurement methods, and that intertwined parts can be detected from the measurement results. The simplest means of measurement is visual inspection by an operator; as shown in FIG. 2a, the intertwined portions occur in the form of binding points of ribbons, so the binding points can be detected visually. Furthermore, a pneumatic detection method consisting of an air nozzle and a pressure receiver, and an optical detection method such as a photoelectric method are also applicable. The method for measuring intertwined portions of interlaced yarn, which is the first aspect of the present invention, has been described above.

Next, a second aspect of the present invention, a device for measuring entangled portions of interlaced yarns, will be described based on the above-mentioned embodiments.
A second object of the present invention is to provide an apparatus for implementing the method described above, which can detect entangled portions reliably and with high efficiency.

As shown in FIG. 1, yarn Y to be measured.

is taken by the take-off machine 7 under a predetermined tension by the tension adjustment device 4. The intertwined part is detected by the intertwined part detection section 10 whose details are shown in FIG. The entangled portion detection unit 10 detects the yarn Y using a guide 12.

is adapted to contact the contact member 11 at a predetermined position on the contact member 11. The light source 14 and the light receiving device 13 are arranged to face each other with the contact member 11 in between so that the optical axis intersects the contact portion. Further, a slit 15 is provided on the front surface of the light receiving device 13 in the thread running direction.

The entangled portion detection unit 10 having such a configuration is connected to the yarn Y under a predetermined tension.
.

When the yarn runs, the yarn Y is formed as described above. A change in shape occurs in the width direction. Due to this shape change, the amount of transmitted light from the light source 14 to the light receiving device 13 changes. Therefore, the light receiving device 13
The amount of light received changes, and the light receiving device 13 outputs an analog signal as shown in FIG. 3a. The DC component of the analog signal is due to background light, etc., and the AC component is a signal due to changes in the shape of the interlace yarn, and the peaks of the AC waveform correspond to the entangled portions of the interlace yarn. It has been done. Therefore, by cutting off the DC component at a preset level Vs, a pulse corresponding to the interlaced portion (shaded portion in FIG. 3a) can be obtained. The pulse is converted into a waveform and is shown in Fig. 3b.
The confounding portion can be suppressed by the pulse counter 23 by creating a waveform suitable for the counter as shown in FIG.
Furthermore, it is also possible to convert the waveform and integrate the pulses as shown in FIG. 3c. , and it goes without saying that the degree of entanglement or the bundling factor can be determined from the integrated number of pulses and the thread length between them. Although the second aspect of the present invention has been described above, the present invention is not limited to this embodiment.

In the embodiment, tension is applied using a tension adjusting device, but other means such as a constant tension winder can also be applied, and any tension applying means that can apply a predetermined tension to the yarn can be applied. . The tension applying means of the present invention is used in this sense. Further, although a circular glass plate is used for the contact member 11 in the embodiment, it is sufficient if the welding portion or a portion corresponding to the vicinity thereof is made light-transmissive. Further, in the embodiment, the light receiving device 13 having a slit is shown, but the light transmitting portion of the contact member 11 can be used instead of the slit, and the slit can be omitted. Further, the shape of the slit has the same function and effect in terms of stable detection of fine holes, slits in the width direction, etc., and can be applied to the present invention. Although the guide 12 is effective in stabilizing the thread guidance of the running yarn and stabilizing the detection of the entangled portion, it is not necessary to provide it in the entangled portion detection unit 10. The details of the present invention have been described above, and the present invention provides a novel method and device for measuring the entangled portion of interlaced yarns, and has very large effects.

That is, it not only provides a highly efficient method for measuring intertwined parts in place of the "hook drop method", but also enables more detailed quality control because a change in shape can be obtained in proportion to the intertwined density. In addition, there is no need to insert a stylus into the yarn as in the ``hook drop method,'' and the method simply brings it into contact with a contact member to cause a temporary change in shape, making it possible to measure yarn while running at high speed. Yes (300m/M in the example device)
The measurement was possible stably up to i), and the measured yarn was not damaged. Therefore, it goes without saying that testing work can be streamlined through highly efficient measurement, but it also has the potential to be applied to online quality control. Measurement examples according to the present invention will be shown below.

Measurement Example 1 The degree of entanglement of various yarns was measured using the apparatus of the example and compared with the measurement using the hook drop method.

The measurement conditions are as follows. The measurement results were as shown in the table below.

Measurement Example 2 Polyester 50 denier 25 filament yarns were given various degrees of entanglement and compared with the measurement results of the "hook drop method".

The measurement conditions are the same as in Measurement Example 1. The measurement results were as shown in the table below.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a detailed diagram of a confounding part detection section of the embodiment, and FIG. 3 is a diagram of output signal processing of the detection section. It is an explanatory diagram. 4 is a tension adjustment device, 5 is a tension detector, 7 is a pulling machine, 10
11 is a contact member; 13 is a photoelectric device; 1
4 is a light source.

Claims (1)

[Scope of Claims] 1. When running an interlaced yarn to measure the entangled portion of the yarn, a change in shape in the width direction is caused at least in the non-interlaced portion of the yarn, and the interlaced portion is measured. The threads are caused to run in contact with a contact member under a predetermined tension within a range where the threads remain entangled, causing the threads to undergo the shape change, and based on the shape change, an entangled portion of the threads is formed. A method for measuring intertwined portions of interlaced yarns, which is characterized by detecting. 2 converting the shape change into an electrical analog signal by photoelectric conversion, and then comparing it with a preset level and converting it into a pulse train signal consisting of pulses corresponding to the exchange part,
A method for measuring an interlaced portion of an interlace yarn according to claim 1, wherein the interlaced portion is detected. 3. A device for running an interlaced yarn to measure the entangled portion of the yarn, comprising: a tension applying means for applying tension to the yarn; and a tension applying means for applying tension to the yarn; a contact member provided in the thread guide of the thread that causes a change in shape in the width direction, and in which at least a portion in contact with the thread is optically transparent; Comprising a light source and a light receiving device arranged to intersect with each other, and a counter that compares an analog signal from the light receiving device with a preset level, converts it into a pulse corresponding to the interlaced portion, and counts the pulse, The tension applying means generates a shape change in the width direction in at least the unentangled portion of the yarn, and the intertwined portion is subjected to the shape change by applying a predetermined tension within a range that maintains the entangled state. 1. An interlaced yarn measuring device, characterized in that the entangled portion of the interlaced yarn is measured by generating the interlaced yarn. 4. Measurement of entangled portions of interlaced yarns according to claim 3, wherein the contact member has a convex cross-section in the running direction of the yarn and has a flat tangent surface on which the yarn is spread in the width direction of the yarn. Device. 5. The interlace yarn intertwining portion measuring device according to claim 4, further comprising a guide for regulating the contact position between the yarn and the contact member before and after the contact member.