JP3512174B2 - Traveling yarn temperature detecting device and its temperature detecting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a running yarn temperature detecting device and a temperature detecting method for the running yarn which are heated by a heating means to detect the temperature of the traveling yarn in a non-contact manner.

[0002]

2. Description of the Related Art Yarn processing often involves heat treatment of yarn. In the processing of synthetic fiber yarns such as filament yarns, the running yarns are stretched and stretched or false twisted while being heated. In such a heating process of the running yarn, it is important to control the heating temperature of the yarn to be constant in order to suppress uneven heating and obtain a processed yarn of uniform quality.

Since it is difficult to measure the heating temperature of the running yarn, the temperature of the running yarn is usually indirectly detected by measuring the temperature of the heating means, and the temperature of the heating means is detected based on the detection result. We are in control. Since the temperature of the traveling yarn is indirectly detected in this way, in order to obtain a processed yarn of uniform quality, the processed yarn is inspected and checked to check the quality of the processed yarn, and then the heating means is used. It is necessary to properly control the heating temperature of the traveling yarn due to.

In recent years, instead of indirectly detecting the temperature of the running yarn, it has been attempted to directly detect the temperature of the running yarn. For example, in order to directly detect the temperature of a fiber such as an optical fiber, as disclosed in Japanese Patent Laid-Open No. 62-47525, a reflecting mirror that reflects the energy emitted from the fiber and the energy reflected by this reflecting mirror are used. It is arranged at a position farther from the fiber to the reflecting mirror so as to have a detection element having a rectangular detection surface having one side in the radial direction of the fiber to be measured, and increases the sensitivity,
A radiation thermometer has been proposed which reduces detection error due to fiber vibration.

[0005]

However, since energy emitted from a thin thread such as a filament thread is small, it is necessary to further increase the sensitivity of temperature detection, and there is room for improvement in terms of sensitivity improvement. In addition, since yarns such as filament yarns that run at high speed are accompanied by complicated vibrations, there is room for improvement in terms of reducing detection errors. Therefore, an object of the present invention is to provide a traveling yarn temperature detecting device and a temperature detecting method therefor capable of detecting the traveling yarn temperature in a non-contact manner with high sensitivity and accuracy.

[0006]

A traveling yarn temperature detecting device according to the present invention is a traveling yarn temperature detecting device in which infrared rays radiated from a traveling yarn are taken into an infrared sensor through an incident part. Means for condensing the infrared rays taken in from the incident part toward the infrared sensor, and arranged between the incident part and the infrared part, and the condenser means is disposed between the incident part and the infrared sensor. A reflecting mirror having a reflecting surface, and a traveling yarn passing space formed between the incident portion and the reflecting mirror, wherein infrared rays emitted from the traveling yarn directly reach the incident portion. The light converging means, the reflecting mirror, and the traveling yarn passing portion are summed up so that those which reach the incident part indirectly through the reflecting mirror and are taken into the infrared sensor through the light condensing means. space is configured, The serial reflector, characterized in that the flat. Then, the traveling yarn passing space is regulated between the focal point of the light collecting means and the reflecting mirror, and even if the traveling yarn moves between the focal point and the reflecting mirror, the traveling yarn is taken into the incident portion. It is preferable to include a restricting unit that suppresses a change in the amount of infrared rays generated. Further, it is preferable that the restriction means is a slit into which the traveling yarn can be inserted .
It is preferred that the pre-Symbol traveling yarn passes space is open in the direction perpendicular along the traveling yarn. In addition, the traveling yarn passing space is surrounded by a sensor main body including the incident portion, the condensing unit, and the infrared sensor, the reflecting mirror, and a bracket between the reflecting mirror and the sensor main body. Therefore, it is preferable to open in a direction orthogonal to the traveling yarn.

In the method for detecting the temperature of the running yarn of the present invention, the infrared rays emitted from the running yarn are taken in from the incident section, and the infrared rays taken in from the incident section are collected by the light collecting means toward the infrared sensor. In the method for detecting the temperature of the traveling yarn, a reflecting mirror having a reflecting surface facing the incident portion is provided, a space for traveling yarn passage is formed between the reflecting mirror and the incident portion, and the traveling yarn is radiated. and the infrared, in addition to leading to the infrared sensor directly through the focusing means, so as to indirectly leads to the infrared sensor via the reflector and the focusing means, the reflecting mirror age
It is characterized by using a flat one. Then, even if the running yarn is passed between the focal point of the light collecting means and the reflecting mirror and the running yarn moves between the focal point and the reflecting mirror, It is preferable to suppress the change.

The infrared rays radiated from the running yarn are summed into those which directly reach the incident portion and those which indirectly reach the incident portion via the reflecting mirror. Since the infrared rays that are summed up and reach the incident portion are condensed by the condensing means, a larger amount of infrared rays are captured by the infrared sensor. With the configuration in which the running yarn is passed between the focal point of the light collecting means and the reflecting mirror, even if the running yarn moves between the focal point and the reflecting mirror, the amount of infrared rays taken into the incident part does not change so much. When the reflecting mirror has a planar shape, the amount of infrared rays taken into the incident part does not change so much even if the yarn diameter changes .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A traveling yarn temperature detecting device according to an embodiment of the present invention will be described with reference to FIGS.

The traveling yarn temperature detecting device 1 shown in FIG. 1 includes a sensor body 2, a reflecting mirror 3, and a space 4 formed between the front surface of the sensor body 2 and the reflecting mirror 3, and the traveling yarn Y. And a regulation means 5 for regulating the yarn path in the space 4 between the reflecting mirror 3 and the focal point 17. The sensor main body 2, the reflecting mirror 3, and the regulating means 5 are integrally attached to a casing (not shown) or separately attached to a pedestal (not shown) to form the temperature detecting device 1.

The sensor body 2 includes a box body 11, an incident portion 12 formed on the front surface 11a of the box body 11, a chopper means 13 arranged so as to overlap the position of the incident portion 12, an infrared sensor 14, A light collecting means 15 which is located between the incident part 12 and the infrared sensor 14 and collects infrared rays taken in from the incident part 12 on the infrared sensor 14, and a circuit board 16 arranged on the base 11b of the box 11. And are equipped with.

The entrance portion 12 is formed as a circular light entrance pupil on the chopper means 13 forming the front surface 11a. That is, the effective diameter of the chopper means 13 also serves as the incident portion 12. The shape of the incident portion 12 is not limited to the circular shape. The light condensing unit 15 is formed of an elliptical mirror 15 a located between the incident part 12 and the infrared sensor 14, and condenses the infrared light captured from the incident part 12 on the infrared sensor 14. As shown in the figure, the elliptic mirror 15a has a focal point 17 on the traveling yarn Y side of the elliptic mirror 15a between the incident portion 12 and the reflecting mirror 3 and on the side close to the incident portion 12, and the infrared ray of the elliptic mirror 15a is The focus on the sensor 14 side is the infrared sensor 1
4 is arranged near the detection surface. Incident part 1
The infrared rays taken in from 2 are more sent to the infrared sensor 14 by the elliptic mirror 15a which is the condensing means 15.

The restricting means 5 is, for example, a slit 5a, and restricts the space 4 for the traveling yarn Y to pass through to the detecting portion between the reflecting mirror 3 and the focal point 17. When the running yarn Y is inserted into the slit 5a, the running yarn Y is automatically moved to the reflecting mirror 3 and the focal point 1.
Located between 7 and. The slit 5a is for positioning the traveling yarn Y between the reflecting mirror 3 and the focal point 17, and its width is sufficiently larger than the swing amplitude of the traveling yarn Y, and is not in contact with the traveling yarn Y. Keep the state of. Slit 5
When the running yarn Y is located in a non-contact state within the a, the running yarn Y is located between the reflecting mirror 3 and the focal point 17.

The reflecting mirror 3 is formed on a flat mirror 3a. The reflected light from the flat mirror 3a, that is, the indirect light,
When the traveling yarn Y is thick, it is blocked by the traveling yarn Y and decreases, but the direct light from the traveling yarn Y increases. On the contrary, when the traveling yarn Y is thin, the direct light decreases, but the ratio of the reflected light, that is, the indirect light, blocked by the traveling yarn Y decreases. Therefore, by making the reflecting mirror 3 a flat mirror 3a, there is an effect that even if the diameter of the traveling yarn Y changes, the output is unlikely to change. In addition, the flat mirror 3a is easy to incorporate in a housing or the like.

The chopper means 13 interrupts the infrared rays emitted from the running yarn Y, and for example, it is preferable to use a liquid crystal thick film type optical modulator (hereinafter referred to as a liquid crystal chopper) from the viewpoint of miniaturization and accuracy. . The infrared sensor 14 is preferably formed of a pyroelectric body. An infrared sensor other than the pyroelectric body can be used. The signal from the infrared sensor 14 is processed by the circuit board 16.

The space 4 for the traveling yarn Y to pass through is formed in the incident portion 12
And the flat mirror 3a. When the restricting means 5 is provided, the space 4 for the traveling yarn Y to pass through is limited to the detecting portion 4a between the focal point 17 and the planar mirror 3a. By forming such a detection unit 4a, no matter where the running yarn Y exists in the detection unit 4a, that is, the focus 17
Even if the running yarn Y moves between the flat mirror 3a and the flat mirror 3a, the amount of infrared rays taken into the infrared sensor 14 does not change, and the sensitivity increases.

In addition to or integrally with the slit 5a, guide means 6 for contacting the traveling yarn Y and suppressing the deflection of the yarn can be provided. When the traveling yarn Y does not change the physical properties of the yarn due to the contact with the guide units 6 and 6, the guide units 6 and 6 can be provided. The width of the guide means 6 is
The swing amplitude of the running yarn Y is smaller than that of the running yarn Y, and the running yarn Y comes into contact with the guide means 6 intermittently, whereby the swing of the running yarn Y is suppressed. The guide means 6 and 6 are for contacting and guiding the traveling yarn Y, and the U-shaped, α-shaped, ring-shaped, etc. shown are used.

The operation of the temperature detecting device 1 having the above structure will be described below. The infrared rays emitted from the traveling yarn Y are directly
The infrared rays radiated from the traveling yarn Y are reflected by the reflecting mirror 3 and are indirectly incident on the inside of the sensor body 2 via the incident portion 12 in addition to being incident on the inside of the sensor body 2 via the incident portion 12. Both the infrared ray directly taken in via the incident part 12 and the infrared ray indirectly taken in via the reflecting mirror 3 and the incident part 12 are condensed by the elliptic mirror 15a, and the infrared light received by the infrared sensor 14 is received by the sensor. Reach the surface. Since the ellipsoidal mirror 15a between the incident part 12 and the infrared sensor 14 is used as the light converging means 15, the total amount of direct light and indirect light reaching the sensor light receiving surface of the infrared sensor 14 increases, The aberration of the optical system is reduced, the light utilization rate is increased, and the temperature detection sensitivity of the running yarn Y can be improved.

The focus 17 of the elliptical mirror 15a and the reflecting mirror 3
It has been confirmed by experiments that the sensitivity hardly changes as much as the traveling yarn Y moves between the focal point 17 of the elliptic mirror 15a and the reflecting mirror 3 by passing the traveling yarn Y between and. In addition, when the reflecting mirror 3 is a flat mirror 3a, the sensitivity is more stable and the temperature can be detected with high accuracy. Therefore, the temperature of the traveling yarn Y, which is greatly shaken by traveling at high speed, can be detected with high accuracy. For example, running yarn Y
If the guide means 6, 6 are not provided, the temperature can always be accurately detected even if the passing position of the traveling yarn Y is slightly shifted due to the influence of touch. The temperature detecting device 1 having the above configuration can accurately detect the temperature even when the traveling yarn Y has a deflection of about 3 mm. In the radiation thermometer of Japanese Patent Laid-Open No. 62-47525, since the degree of deflection allowed for the running yarn Y is 0.3 mm, the temperature detecting device 1 according to the present invention is remarkably excellent in measurable redundancy.

Further, by cleaving infrared rays at high speed by the chopper means 13, the output of the infrared sensor 14 using a pyroelectric material can be made appropriate. As a result, in the temperature detecting device 1, the infrared rays emitted from the traveling yarn Y are sufficiently taken into the infrared sensor 14, and the chopper means 13 interrupts them at a high speed so that the temperature of the thin yarn Y traveling at a high speed while vibrating does not contact. Therefore, it is possible to detect directly and accurately.
Further, if a generally low-priced pyroelectric sensor is used as the infrared sensor 14, the manufacturing cost can be kept low.

The temperature detecting device 1 can employ the arrangements shown in FIGS. Temperature detection device 1 shown in FIG.
Is an elliptic mirror 15 which is a liquid crystal chopper.
It is arranged between a and the infrared sensor 14. The incident portion 12 is formed in the hole 11d in the front surface 11a of the box body 11. The focal point 17 of the elliptical mirror 15a is formed at a position away from the hole 11d toward the reflecting mirror 3. In this case, the reflecting mirror 3 and the front surface 11 a of the box body 11 define the space 4. Further, the space 4 is restricted between the focal point 17 and the reflecting mirror 3 by the restricting means 5.

In the temperature detecting device 1 shown in FIG. 3, the reflecting mirror 3 is formed on a spherical mirror 3b, and the spherical mirror 3b is opposed to the running yarn Y. By making the reflecting mirror 3 spherical, the infrared rays radiated from the running yarn Y are incident on the incident part 12 (1
The light can be condensed and reflected toward 1d).

In the temperature detecting device 1 shown in FIG. 4, a convex lens 21 is used as the light converging means, the chopper means 13 is arranged between the convex lens 21 and the infrared sensor 14, and a spherical mirror 3b is used as the reflecting mirror 3. It was what I had. Chopper means 1 including an incident part 12, a convex lens 21, and a liquid crystal chopper 1.
3 and the infrared sensor 14 are arranged in series in this order. By making the reflection plate 3 a spherical mirror 3b, infrared rays emitted from the traveling yarn Y are reflected toward the incident portion 12, and
Can collect light. As the reflecting mirror 3, instead of a spherical mirror, a parabolic, elliptical, or a concave mirror such as a polyhedron can be used.

In any of the temperature detecting devices 1 shown in FIGS. 2 to 4, the focal point 17 is located at the incident portion 12 of the front surface 11a of the box body 11.
It is at a position slightly away from the reflector 3 toward the reflector 3. In addition,
The focal point 17 can also be arranged in the vicinity of the incident portion 12 of the front surface 11a.

Next, an application example of the temperature detecting device 1 of the present invention will be described with reference to the yarn processing machine X shown in FIG. The yarn processing machine X of FIG. 5 is configured by arranging a plurality of weights for yarn processing in parallel,
The synthetic fiber yarn Y running on each weight is heat-treated by the heating means 31 of each weight to obtain a processed yarn. In processing the synthetic fiber yarn Y, it is an important factor to keep the heating temperature of the synthetic fiber yarn constant in order to suppress uneven heating and obtain a processed yarn of uniform quality. Therefore, the temperature detecting device 1 is fixedly arranged on the yarn outlet side of the heating means 31 of each weight, and the yarn Y traveling on each weight is moved.
Detects the temperature of. Each temperature detection device 1 is connected to a control device 51 that controls the entire yarn processing machine X. It should be noted that the temperature detection device 1 is provided for each predetermined number of weights (for example, one for every 12 weights).
May be fixedly arranged and only the yarn temperature of the representative weight may be detected.

The control device 51 stores a correction table for correcting the output of each temperature detection device 1 into a temperature measurement value. The correction table is a function (parameter) corresponding to thread conditions such as thread thickness, thread type and thread color. The correction table is set as a function by variously selecting the thread thickness, the thread type, the thread condition of the thread color, and the thread temperature, and measuring the temperature in advance by the temperature detection device 1. The control device 51 selects a function of the correction table from the yarn condition input from the keyboard 52, corrects the output of each temperature detection device 1 to a temperature measurement value based on this function, and displays it on the display 53. Further, the control device 51 controls the heating means 31 of each weight based on the measured temperature value to make the heating temperature for the yarn Y traveling in each weight appropriate.

As described above, when the temperature detecting device 1 of the present invention is applied to the yarn processing machine X, the output of each temperature detecting device 1 is corrected to a temperature measurement value, and each heating means 3 is based on the temperature measurement value.
The heating temperature of 1 can be controlled. Therefore, it is possible to eliminate the temperature variation of the synthetic fiber yarn Y between the weights and obtain a textured yarn of uniform quality. Further, since the temperature detecting device 1 can be configured with a low price as described above, the manufacturing cost of the yarn processing machine X can be suppressed even if the temperature detecting device 1 is arranged for each weight.

Further, a modified example of the temperature detecting device of the present invention,
This will be described with reference to FIG. In FIG. 6, the same reference numerals as those in FIG. 1 indicate the same members, and the description thereof will be omitted.

The temperature detecting device 61 shown in FIG. 6 is of a handy type so that the operator can detect the yarn temperature of an arbitrary weight while holding it by hand. The temperature detecting device 61 has an incident portion 12 formed on the front surface of the sensor body 2, and the incident portion 12 is provided with a chopper means 13 composed of a liquid crystal chopper. In the sensor body 2, an elliptical mirror 15 that receives and collects infrared rays from the incident section 12 and an infrared sensor 14 that receives the infrared rays collected by the elliptic mirror 15 are arranged. The focus of the elliptic mirror 15 is located at a position slightly distant from the incident portion 12 toward the reflecting mirror 3 side. Also, on the front end side of the sensor body 2,
A bracket 63 having a U-shaped cross section is provided, and the bracket 63
The support member 64 is supported by. The support member 64 is mounted in the bracket 63 at a distance from the incident portion 12. In addition, the support member 64 is provided with a planar mirror 3 a that serves as the reflecting mirror 3. The mirror 3 a is attached to the support member 64 so as to face the incident portion 12. In the bracket 63, slits 5 serving as a restricting means are provided in front of and behind the sensor body 2.
a is formed. The slit 5a positions the running yarn Y in a non-contact manner between a focal point 17 (not shown) and the reflecting mirror 3. Further, the temperature detection device 61 is connected to the control device 65. This control device 65 has the same function as the control device 51 of FIG. 5, and is provided with a keyboard 66 and a display 67.

The operator grips the sensor body 2 and positions the running yarn Y in the slit 5a in a non-contact state.
With this, the temperature of the traveling yarn Y can be detected by a simple operation by the operator.

In the temperature detecting device 1 of the present invention, as shown in FIG.
-It is not limited to what is shown in FIG. 6, For example, the following forms can be taken. (1) As the chopper means 13, it is possible to employ one that mechanically interrupts infrared rays emitted from the traveling yarn Y by using an optical chopper as a blade that vibrates or rotates.

(2) When the guide means 6 is provided, it does not necessarily have to be provided before and after the sensor main body 2, and if the vibration of the traveling yarn Y can be suppressed, it is provided only on either the front or rear of the sensor main body 2. Can be adopted.

(3) The condensing means 15 is not limited to an elliptic mirror or a convex lens, but may be a prism or the like for condensing the infrared radiation from the running yarn Y on the infrared sensor 14.

(4) In FIG. 1, the running direction of the running yarn Y is running in a direction orthogonal to the reflecting direction of the elliptical mirror 15a of the light collecting means 15. However, the running direction of the running yarn Y is about 90 °. The running yarn Y may be rotated and run in parallel with the reflection direction of the elliptical mirror 15a. As described above, the traveling direction of the traveling yarn Y may be any direction as long as it is substantially parallel to the front surface 11 a of the box body 11 and is located in the space 4.

(5) The temperature detecting device 1 is applied to a yarn processing machine having various heating means. It is applicable to a contact type plate heater, a draw false twisting machine having a non-contact type far infrared heater, a take-up winder having a hot roller around which traveling yarn is wound, and the like. In addition, the temperature detection device 1
Although the filament yarn is suitable as the traveling yarn Y to which is applied, it is also applicable to the spun yarn that is steam-heated.

[0036]

EFFECT OF THE INVENTION Temperature detecting device and temperature of running yarn of the present invention
In the detection method , the infrared rays radiated from the running yarn can be taken into the infrared sensor as a sufficient amount for detecting by the reflecting mirror and the condensing means, so that the temperature of the thin yarn running while vibrating does not contact. Therefore, it can be detected directly and accurately. Thereby, when the traveling yarn is heated and processed, the heating temperature of the heating means can be controlled based on the temperature detection of the traveling yarn, and the processed yarn of uniform quality can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a traveling yarn temperature detection device of the present invention.

FIG. 2 is a cross-sectional view showing a modified example of the running yarn temperature detecting device of the present invention.

FIG. 3 is a cross-sectional view showing a modified example of the running yarn temperature detecting device of the present invention.

FIG. 4 is a cross-sectional view showing a modified example of the running yarn temperature detecting device of the present invention.

FIG. 5 is a schematic view showing a yarn processing machine to which the traveling yarn temperature detecting device of the present invention is applied.

FIG. 6 is a perspective view showing a modified example of the running yarn temperature detecting device of the present invention.

[Explanation of symbols]

1 Temperature detector 2 sensor body 3 reflector 4 space 5 Regulatory means 5a slit 6 guide means 12 incident part 13 Chopper means 14 Infrared sensor 15 Condensing means 15a elliptical mirror 17 Focus

Front Page Continuation (72) Inventor Keishiro Takakura 1 Nishinokyo Kuwabara-cho, Nakagyo-ku, Kyoto City, Kyoto Prefecture Shimadzu Corporation (56) Reference JP 62-47525 (JP, A) JP 7-243915 ( JP, A) JP 54-36870 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01J 5/00-5/62

Claims (7)

(57) [Claims] 1. A temperature detecting device for a traveling yarn, wherein infrared rays radiated from the traveling yarn are taken into an infrared sensor via an incident portion, the incident portion being located between the incident portion and the infrared sensor. Condensing means for condensing infrared rays taken in from the infrared sensor, a reflector having a reflection surface facing the incident section and spaced from the incident section, the incident section and the reflection A traveling yarn passing space formed between the traveling yarn and a mirror, wherein infrared rays emitted from the traveling yarn directly reach the incident portion and indirectly reach the incident portion via the reflecting mirror. The condensing means, the reflecting mirror, and the traveling yarn passing space are configured such that the above is added and taken into the infrared sensor via the condensing means, and the reflecting mirror is made flat. Characteristic of running yarn Temperature detection device. 2. Even if the traveling yarn is moved between the focal point and the reflecting mirror, the traveling yarn passing space is regulated between the focal point of the light collecting means and the reflecting mirror. The traveling yarn temperature detection device according to claim 1, further comprising a regulation unit that suppresses a change in the amount of infrared rays taken into the section. 3. The traveling yarn temperature detecting device according to claim 2, wherein the regulating means is a slit into which the traveling yarn can be inserted. 4. An assembly as traveling yarn according to any preceding claim wherein the traveling yarn passes space is open in the direction perpendicular along the traveling yarn 1-3. 5. The traveling yarn passing space is the entrance portion,
It is surrounded by a sensor body including the light collecting means and the infrared sensor, the reflecting mirror, and a bracket between the reflecting mirror and the sensor body, and is opened in a direction orthogonal to the traveling yarn. The temperature detecting device for the running yarn according to claim 4 . 6. A method for detecting the temperature of a running yarn, wherein infrared rays radiated from the running yarn are taken in from an incident portion, and the infrared rays taken in from the incident portion are collected by a condensing means toward the infrared sensor. A reflecting mirror having a reflecting surface facing the incident part is provided, a space for running yarn passing is formed between the reflecting mirror and the incident part, and infrared rays emitted from the running yarn are collected by the condensing means. In addition to directly guiding to the infrared sensor via, it is possible to indirectly guide to the infrared sensor via the reflecting mirror and the condensing means.
The traveling yarn temperature detecting method is characterized in that a flat one is used as the reflecting mirror . 7. The running yarn is passed between the focal point of the light converging means and the reflecting mirror, and even if the running yarn moves between the focal point and the reflecting mirror, the running yarn is taken into the incident portion. The method for detecting the temperature of the running yarn according to claim 6 , wherein a change in the amount of infrared rays is suppressed.