JP2022018310A - Unevenness detection device and unevenness detection method for linear body - Google Patents

Abstract

To reduce wrong detection on unevenness of a linear body to be inspected.SOLUTION: An unevenness detection device for linear body has: a light projection part which projects light on a traveling linear body; a light reception part which receives the light projected by the light projection part; a first guide roller which guides the linear body to travel upstream when passing through a detection space between the light projection part and light reception part; a second guide roller which guides the linear body to travel downstream when passing through the detection space; a cover which covers the light projection part, light reception part, the first guide roller, and the second guide roller; and a supply part which supplies clean air into the cover. The cover is provided with an air supply part communicating with the supply part, an entry-side opening part that the linear body enters, and an exit-side opening part that the linear body exits from.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a linear body unevenness detection device and an unevenness detection method.

Patent Document 1 describes a linear body unevenness detection device and unevenness detecting device for projecting light onto a traveling linear body and receiving the projected light to optically detect unevenness on the surface of the linear body. The detection method is disclosed.
Patent Document 2 discloses a guide roller that guides the traveling of an optical fiber in which a glass fiber is coated with a resin.

Japanese Unexamined Patent Publication No. 2004-12414 Japanese Unexamined Patent Publication No. 2013-28513

In a linear body, for example, an optical fiber, minute irregularities may be locally generated on the outer periphery of a coated optical fiber wire or an optical fiber core wire coated with a colored layer. If there is such unevenness, foreign matter due to the unevenness may be clogged in the die hole in the coloring process or the tape forming process. In that case, problems such as poor coating and breakage of the linear body occur, so it is necessary to detect this unevenness. Therefore, a linear body unevenness detection device for optically detecting the unevenness of the linear body is used (for example, Patent Document 1).

In the above-mentioned linear body unevenness detection device, light may be blocked or scattered by floating dust, and the linear body unevenness detection device may be erroneously detected. Therefore, for example, in the linear unevenness detection device disclosed in Patent Document 1, the detection space is covered with a cover, and clean gas is supplied into the cover to suppress the invasion of suspended dust into the detection space. There is.

Further, there is a possibility that the linear body may enter the detection space with foreign matter attached, and in this case as well, the unevenness of the linear body may be erroneously detected. Therefore, it is conceivable to strongly blow a clean gas onto the linear body before entering the detection space to blow off the foreign matter. However, when the flow rate of the clean gas is increased in an attempt to remove foreign matter, the linear body is affected by the flow of the clean gas, and the linear runout increases. Then, there is a possibility that the line runout is erroneously detected as unevenness.
In order to improve the efficiency of manufacturing the linear body, it is desirable to increase the linear speed at the time of manufacturing, but if the linear speed of the linear body is increased, the linear runout becomes large. Further, if the linear velocity of the linear body is increased, the possibility that foreign matter enters the detection space together with the linear body increases.

It is an object of the present disclosure to provide an unevenness detection device and an unevenness detection method for a linear body, which can reduce erroneous detection of unevenness on the linear body to be inspected.

The unevenness detection device for a linear body according to one aspect of the present disclosure includes a light projecting unit that emits light to a traveling linear body and a light projecting unit.
A light receiving unit that receives the light projected from the light projecting unit and a light receiving unit.
A first guide roller that guides the traveling on the upstream side with respect to the linear body passing through the detection space between the light emitting portion and the light receiving portion.
A second guide roller that guides the traveling on the downstream side with respect to the linear body passing through the detection space, and
A cover that covers the light projecting portion, the light receiving portion, the first guide roller, and the second guide roller.
A supply unit that supplies clean gas into the cover,
Have,
The cover is provided with an air supply portion that communicates with the supply portion, an inlet side opening through which the linear body enters, and an exit side opening through which the linear body exits.

The method for detecting unevenness of a linear body according to one aspect of the present disclosure is a detection space for optically detecting unevenness on the surface of a linear body by a light projecting portion, a light receiving portion, and the light emitting portion and the light receiving portion. And the first guide roller and the second guide roller are covered with a cover,
A clean gas is supplied into the cover,
The linear body is made to enter the cover through the opening on the incoming wire side provided in the cover.
The linear body entered in the cover is guided to the detection space by the first guide roller.
Light is projected from the light projecting portion onto the linear body traveling in the detection space, and the projected light is received by the light receiving unit to optically check the unevenness of the surface of the linear body. Detect and
The linear body that has passed through the detection space is guided by the second guide roller to the wire exit side opening provided in the cover.

According to the present disclosure, it is possible to reduce erroneous detection of unevenness on the linear body to be inspected.

It is a schematic block diagram which shows an example of the unevenness detection apparatus of a linear body which concerns on embodiment of this disclosure. It is a schematic cross-sectional view of the line AA of the detection part in FIG. It is sectional drawing of the 1st guide roller or the 2nd guide roller. It is sectional drawing of the peripheral groove of the 1st guide roller or the 2nd guide roller. It is sectional drawing of the peripheral groove of a general conventional guide roller. It is a figure explaining the behavior of the foreign matter such as the floating dust by the ejection of the clean gas in the opening on the entrance side of a cover.

[Explanation of Embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.
The linear unevenness detection device according to one aspect of the present disclosure is
(1) A light projecting unit that emits light to a traveling linear body,
A light receiving unit that receives the light projected from the light projecting unit and a light receiving unit.
A first guide roller that guides the traveling on the upstream side with respect to the linear body passing through the detection space between the light emitting portion and the light receiving portion.
A second guide roller that guides the traveling on the downstream side with respect to the linear body passing through the detection space, and
A cover that covers the light projecting portion, the light receiving portion, the first guide roller, and the second guide roller.
A supply unit that supplies clean gas into the cover,
Have,
The cover is provided with an air supply portion that communicates with the supply portion, an inlet side opening through which the linear body enters, and an exit side opening through which the linear body exits.
According to the above-mentioned linear body unevenness detection device, since the detection space is inside the cover to which the clean gas is supplied, it is possible to suppress the entry of foreign matter such as floating dust. Further, guide rollers (first guide roller and second guide roller) that guide the linear body before and after passing through the detection space are also in the cover supplied with the clean gas. As a result, the striatum of the linear body due to the wind pressure of the supplied clean gas can be suppressed, and the running of the linear body in the detection space can be stabilized by both guide rollers. Therefore, it is possible to reduce erroneous detection of unevenness on the linear body inspected in the detection space.

(2) The first guide roller and the second guide roller each have a V-shaped peripheral groove.
The circumferential groove comprises a first side surface and a second side surface forming a V shape.
The first side surface and the second side surface may be formed so as to be in contact with the traveling linear body.
According to the above-mentioned unevenness detection device for the linear body, both guide rollers (the first guide roller and the second guide roller) can sandwich the linear body traveling in the peripheral groove, so that the wire can be sandwiched. It is possible to suppress the striatum of the shape.

The method for detecting unevenness of a linear body according to one aspect of the present disclosure is as follows.
(3) A detection space for optically detecting unevenness on the surface of the linear body by the light projecting portion, the light receiving portion, the light emitting portion and the light receiving portion, a first guide roller, and a second guide. The rollers and are covered with a cover,
A clean gas is supplied into the cover,
The linear body is made to enter the cover through the opening on the incoming wire side provided in the cover.
The linear body entered in the cover is guided to the detection space by the first guide roller.
Light is projected from the light projecting portion onto the linear body traveling in the detection space, and the projected light is received by the light receiving unit to optically check the unevenness of the surface of the linear body. Detect and
The linear body that has passed through the detection space is guided by the second guide roller to the wire exit side opening provided in the cover.
According to the above-mentioned method for detecting unevenness of the linear body, the unevenness of the surface of the linear body is detected in the detection space inside the cover to which the clean gas is supplied, so that foreign matter such as floating dust enters the detection space. Can be suppressed. The guide rollers (first guide roller and second guide roller) before and after the detection space are also covered with a cover. As a result, the striatum of the linear body due to the wind pressure of the supplied clean gas can be suppressed, and the running of the linear body in the detection space can be stabilized by both guide rollers. Therefore, it is possible to reduce erroneous detection of unevenness on the linear body inspected in the detection space.

(4) The clean gas may be ejected from the inlet side opening to the outside of the cover.
According to the above-mentioned method for detecting unevenness of the linear body, the unevenness of the surface of the linear body is detected while the clean gas is ejected to the outside of the cover from the opening on the incoming line side of the linear body in the cover. As a result, it is possible to prevent foreign matter such as floating dust from entering the cover by the traction flow of the linear body from the opening on the incoming line side.

(5) The flow velocity of the clean gas ejected from the entry-side opening may be larger than the linear velocity of the linear body entering from the entry-side opening.
According to the above-mentioned method for detecting unevenness of a linear body, the flow velocity of the clean gas ejected from the opening on the incoming line side is larger than the linear velocity of the linear body entering from the opening on the incoming line side, so that foreign matter such as floating dust is present. It is possible to more reliably suppress the entry into the cover by the traction flow of the linear body from the opening on the entry side.

[Details of Embodiments of the present disclosure]
Specific examples of the linear body unevenness detection device and the unevenness detection method according to the embodiment of the present disclosure will be described below with reference to the drawings.
It should be noted that the present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

FIG. 1 is a schematic configuration diagram showing an example of a linear unevenness detection device according to an embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view taken along the line AA of the detection unit 10.
As shown in FIG. 1, the linear body unevenness detection device 1 of this example includes a detection unit 10, a first guide roller 20, a second guide roller 30, a cover 40, and a supply unit 50. I have.

The detection unit 10 is provided so that the traveling optical fiber core wire 2 (an example of a linear body) is located at the center of the detection space 12 formed so as to be surrounded by the detection unit main body 11. The optical fiber core wire 2 has a configuration in which a plurality of resin layers are coated on an optical fiber produced by a wire drawing step, and a colored layer is further coated on the outer periphery thereof.

The detection unit 10 includes two pairs of a light projecting unit 13 and a light receiving unit 14. These are arranged so that one light receiving unit 14 faces each of one light emitting unit 13. Inside the detection unit main body 11, a discrimination unit (not shown) connected to the light receiving unit 14 is provided. This discriminating unit continuously reads the data of the amount of received light received by the light receiving unit 14, calculates the average value of the amount of received light accumulated in a certain period of time immediately before that, and calculates the difference from the read value. .. Then, when the difference amount exceeds a preset fixed amount, a signal for detecting unevenness is output.

The first guide roller 20 guides the optical fiber core wire 2 passing through the detection space 12 to travel on the upstream side (hereinafter, simply referred to as the upstream side) in the direction in which the optical fiber core wire 2 travels. It is provided in. The second guide roller 30 guides the optical fiber core wire 2 passing through the detection space 12 to travel on the downstream side (hereinafter, simply referred to as the downstream side) in the direction in which the optical fiber core wire 2 travels. It is provided in.

The cover 40 is provided so as to cover the detection unit 10, the first guide roller 20, and the second guide roller 30. The supply unit 50 is provided outside the cover 40, and supplies the clean gas 3 into the cover 40 as shown by an arrow.

The cover 40 is provided with an inlet side opening 41 on the upstream side surface 40a into which the optical fiber core wire 2 enters. The side surface 40b on the downstream side is provided with an exit side opening 42 through which the optical fiber core wire 2 exits. Further, the side surface 40b is provided with an air supply unit 43 that communicates with the supply unit 50.

FIG. 3 is a cross-sectional view of the first guide roller 20 (second guide roller 30). FIG. 4 is a cross-sectional view of a peripheral groove of the first guide roller 20 (second guide roller 30) in a state where the optical fiber core wire 2 is running.

As shown in FIG. 3, the first guide roller 20 and the second guide roller 30 each have a V-shaped peripheral groove 21 (31). The peripheral groove 21 (31) includes a first side surface 22 (32) and a second side surface 23 (33) forming a V shape. As shown in FIG. 4, the first guide roller 20 (second guide roller 30) is formed so that the sandwiching angle composed of the first side surface 22 (32) and the second side surface 23 (33) is an acute angle. The width W1 of the bottom surface 24 (34) is smaller than the outer diameter R of the optical fiber core wire 2. The outer diameter of the optical fiber core wire 2 is about 0.2 mm. Therefore, the first side surface 22 (32) and the second side surface 23 (33) are formed so as to be in contact with the traveling optical fiber core wire 2.

In order to compare the structure of the peripheral groove between the guide roller (first guide roller 20, second guide roller 30) and the conventional guide roller used in the linear body unevenness detection device 1 according to the present embodiment. FIG. 5 shows a cross section of the peripheral groove 121 of a general conventional guide roller 120.

As shown in FIG. 5, in the conventional guide roller 120, the width W2 of the bottom portion 124 of the peripheral groove 121 is larger than the outer diameter R of the optical fiber core wire 2. This is because it is difficult to form the bottom portion 124 of the peripheral groove 121 narrowly because high-precision machining is required to form the side surfaces 122 and 123 of the peripheral groove 121 at an acute angle. Therefore, when the optical fiber core wire 2 is traveled by using the conventional guide roller 120, the traveling position may move between the side surfaces 122 and 123 of the peripheral groove 121, and the optical fiber core wire 2 may travel in a wobbling manner. Therefore, there is a possibility that line runout may occur when the optical fiber core wire 2 travels.

In contrast to the conventional guide roller 120 described above, the first guide roller 20 (second guide roller 30) has an optical fiber core on which the first side surface 22 (32) and the second side surface 23 (33) travel. It is formed so as to come into contact with the wire 2. As a result, the optical fiber core wire 2 traveling in the peripheral groove 21 (31) can be sandwiched. Therefore, it is possible to suppress line runout during traveling of the optical fiber core wire 2.

Next, with reference to FIGS. 1 to 4, a method for detecting unevenness of the optical fiber core wire (an example of a linear body) 2 will be described.
In this example, the unevenness of the colored layer is detected with respect to the optical fiber core wire 2 coated with the colored layer in the coloring step. First, as shown by the arrow in FIG. 1, the clean gas 3 is supplied into the cover 40. After the inside of the cover 40 is filled with the clean gas 3, the optical fiber core wire 2 is inserted into the cover 40 from the entrance side opening 41. The optical fiber core wire 2 entered in the cover 40 is guided to the detection space 12 by the first guide roller 20. Light is projected from the light projecting unit 13 onto the optical fiber core wire 2 traveling in the detection space 12, and the projected light is received by the light receiving unit 14, and the unevenness of the surface of the optical fiber core wire 2 is optically measured. To detect.

Specifically, laser light (an example of the light to be projected) is projected from the two light projecting units 13 onto the optical fiber core wire 2 in a band shape. Further, one light receiving unit 14 is arranged so as to face one light projecting unit 13, and the light receiving unit 14 receives the laser light that has passed around the optical fiber core wire 2. Therefore, the light receiving unit 14 receives a small amount of light among the light projected from the light projecting unit 13 by the amount of light blocked by the optical fiber core wire 2.

The discriminating unit (not shown) continuously reads the data of the amount of received light received by the light receiving unit 14, calculates the average value of the amount of received light accumulated in a certain period of time immediately before that, and uses the reading value as the reading value. Calculate the difference. When this difference amount exceeds a preset fixed amount, a signal for detecting unevenness is output.

When there is no unevenness on the surface of the projected optical fiber core wire 2, the amount of laser light received by the light receiving unit 14 is a certain amount, but the uneven portion on the surface enters the detection space 12 and is projected. Then, the amount of light shielded by the optical fiber core wire 2 changes. As a result, the amount of laser light received by the light receiving unit 14 changes, and the presence of unevenness is detected.

The optical fiber core wire 2 that has passed through the detection space 12 is guided to the wire exit side opening 42 by the second guide roller 30. As a result, the optical fiber core wire 2 is drawn out from the wire exit side opening 42 to the outside of the cover 40, and is wound up by, for example, a winding drum (not shown).

Further, as shown in FIG. 6, during the execution of the unevenness detection of the optical fiber core wire 2, the clean gas 3 is ejected to the outside of the cover 40 from the wire entry side opening 41 provided on the side surface 40a of the cover 40. I'm letting you. At this time, the flow velocity of the clean gas 3 ejected from the entry-side opening 41 is higher than the linear velocity of the optical fiber core wire 2 pulled from the entry-side opening 41 in the direction indicated by the arrow B. That is, since the amount of the clean gas 3 supplied from the supply unit 50 is large, the inside of the cover 40 is in a pressurized state.

The flow velocity of the clean gas 3 ejected from the inlet side opening 41 is larger than the linear velocity of the optical fiber core wire 2 entering from the inlet side opening 41. Therefore, as shown by the arrow C in FIG. 6, it is possible to prevent foreign matter 4 such as floating dust from entering the cover 40 from the entrance side opening 41 by the traction flow of the optical fiber core wire 2.

As described above, according to the linear body unevenness detection device 1 and the unevenness detection method according to the present embodiment, the detection space 12 is in the cover 40 to which the clean gas 3 is supplied, so that floating dust and the like can be prevented. It is possible to prevent foreign matter 4 from entering. Further, the guide rollers (first guide roller 20 and second guide roller 30) that guide the optical fiber core wire 2 before and after passing through the detection space 12 are also contained in the cover 40 to which the clean gas 3 is supplied. be. As a result, the line runout of the optical fiber core wire 2 due to the wind pressure of the supplied clean gas 3 can be suppressed, and the running of the optical fiber core wire 2 in the detection space 12 can be stabilized by the guide rollers 20 and 30. Therefore, it is possible to reduce erroneous detection of unevenness on the optical fiber core wire 2 inspected in the detection space 12.

(Example)
In the embodiment, the unevenness detection device 1 of the linear body according to the present embodiment was used to detect the unevenness of the optical fiber core wire 2 by the above-mentioned method for detecting the unevenness of the linear body according to the present embodiment.
In the comparative example, the unevenness of the optical fiber core wire 2 was detected by using a conventional linear body unevenness detection device. In the linear body unevenness detecting device in this comparative example, the first guide roller 20 and the second guide roller 30 of the linear body unevenness detecting device 1 according to the present embodiment are provided with the peripheral groove 121 shown in FIG. This corresponds to a structure in which the cover 40 is removed and only the detection unit 10 is covered with a cover instead of the conventional guide roller 120 provided with the above.

In the above Examples and Comparative Examples, the amount of line runout of the optical fiber core wire 2 and the frequency of erroneous detection occurred were measured. At the time of measurement, the amount of clean gas 3 supplied from the supply unit 50 was set to 0.5 m ³ / min. Then, the incoming line side opening 41 and the outgoing line side opening 42 are made into circular openings having a diameter of 10 mm. As a result, the flow velocity of the clean gas 3 ejected from the incoming line side opening 41 and the outgoing line side opening 42 became 3183 m / min.

The measurement was carried out as follows. The optical fiber core wire 2 coated with the colored layer was run for 1000 km by the linear concavo-convexity detection devices of the above-mentioned Example and Comparative Example, respectively. Then, when the unevenness of the surface (colored layer) of the optical fiber core wire 2 was detected by the detection unit 10, the optical fiber core wire 2 was cut, and it was confirmed by palpation whether or not the portion had irregularities. At the time of this confirmation, if there was no unevenness, it was regarded as an erroneous detection, and the number of times of this erroneous detection was counted. In addition, the amount of running line runout was measured by the detection unit 10.

In the comparative example, the measurement was performed at two different linear speeds, one when the optical fiber core wire 2 was set to 1000 m / min and the other when the optical fiber core wire 2 was set to 1500 m / min.
In the examples, the linear speed of the optical fiber core wire 2 was set to 1500 m / min for measurement.
In Table 1 below, the measurement result when the linear speed of the optical fiber core wire 2 is 1000 m / min in the comparative example is 1.0 (reference), and the amount of line runout and the frequency of false detection occur with respect to this reference. (The number of erroneous detections when the optical fiber core wire 2 is run for 1000 km) is shown.

As shown in the results of Table 1, in the examples, the amount of line runout and the frequency of erroneous detection were smaller than in the case where the linear velocity of the optical fiber core wire 2 was the same as that in the comparative example. As can be seen from the results of the comparative examples in Table 1, if the same device is used, the amount of line runout and the frequency of erroneous detection increase as the line speed of the optical fiber core wire 2 increases. In the examples, the amount of line runout and the frequency of false detections were smaller than in the case where the line speed of the optical fiber core wire 2 of the comparative example was slower than that of the examples.

As described above, since the amount of line runout in the examples is smaller than that in the comparative example, the running of the optical fiber core wire 2 in the detection space 12 is stable. Further, since the erroneous detection occurrence frequency is lower in the examples than in the comparative example, it is possible to reduce the erroneous detection of the unevenness of the optical fiber core wire 2 inspected in the detection space 12. Further, in the embodiment, the amount of line runout and the frequency of erroneous detection are smaller than in the case where the linear velocity of the optical fiber core wire 2 is slow, so that the unevenness inspection of the optical fiber core wire 2 can be performed at high speed.

In the above embodiment, the optical fiber core wire coated with the colored layer is a linear body, but the present disclosure is not limited to this. The linear body in the unevenness detection device and the unevenness detection method of the linear body according to the present disclosure includes, for example, a coated optical fiber wire, an optical fiber tape core wire in which optical fiber core wires are connected by a tape resin, and the like. It may be a linear body such as a coated metal wire. That is, it can also be applied to detect the unevenness of these coatings and tape resins.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Further, the number, position, shape and the like of the constituent members described above are not limited to the above-described embodiment, and can be changed to a number, position, shape and the like suitable for carrying out the present invention.

1: Concavo-convexity detection device 2: Optical fiber core wire (an example of a linear body)
3: Clean gas 4: Foreign matter 10: Detection unit 11: Detection unit body 12: Detection space 13: Floodlight unit 14: Light receiving unit 20: First guide roller 30: Second guide roller 21, 31: Circumferential groove 22 , 32: First side surface 23, 33: Second side surface 24, 34: Bottom surface 40: Cover 40a, 40b: Cover side surface 41: Ingress side opening 42: Out line side opening 43: Air supply part 50: Supply part

Claims (5)

A light projecting unit that emits light to a traveling linear body,
A light receiving unit that receives the light projected from the light projecting unit and a light receiving unit.
A first guide roller that guides the traveling on the upstream side with respect to the linear body passing through the detection space between the light emitting portion and the light receiving portion.
A second guide roller that guides the traveling on the downstream side with respect to the linear body passing through the detection space, and
A cover that covers the light projecting portion, the light receiving portion, the first guide roller, and the second guide roller.
A supply unit that supplies clean gas into the cover,
Have,
The cover is provided with an air supply portion that communicates with the supply portion, an inlet side opening through which the linear body enters, and an exit side opening through which the linear body exits.
A device for detecting unevenness of a linear body. The first guide roller and the second guide roller each have a V-shaped peripheral groove.
The circumferential groove comprises a first side surface and a second side surface forming a V shape.
The first side surface and the second side surface are formed so as to be in contact with the traveling linear body.
The unevenness detection device for a linear body according to claim 1. A detection space for optically detecting the unevenness of the surface of the linear body by the light projecting portion, the light receiving portion, the light emitting portion and the light receiving portion, a first guide roller, a second guide roller, and the like. Is covered with a cover,
A clean gas is supplied into the cover,
The linear body is made to enter the cover through the opening on the incoming wire side provided in the cover.
The linear body entered in the cover is guided to the detection space by the first guide roller.
Light is projected from the light projecting portion onto the linear body traveling in the detection space, and the projected light is received by the light receiving unit to optically check the unevenness of the surface of the linear body. Detect and
The linear body that has passed through the detection space is guided by the second guide roller to the wire exit side opening provided in the cover.
Method for detecting unevenness of a linear body. The clean gas is ejected from the inlet side opening to the outside of the cover.
The method for detecting unevenness of a linear body according to claim 3. The flow velocity of the clean gas ejected from the entry-side opening is larger than the linear velocity of the linear body entering from the entry-side opening.
The method for detecting unevenness of a linear body according to claim 4.

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