JP4699179B2 - Wire inspection equipment for wire ends - Google Patents

Description

  The present invention relates to an apparatus for inspecting an exposed core wire by removing the insulation coating from the end portion of the electric wire, and more specifically, is there a defect in the strand constituting the core wire by irradiating the core wire with laser light? The present invention relates to a technology for inspecting whether there is any.

  Conventionally, an electric wire terminal processing device that removes the insulation coating from the electric wire terminal portion to expose the core wire and crimps the terminal to the core wire has been widely used. There are cases where devices for inspecting whether or not the inspection has been performed are arranged in parallel (for example, see Patent Documents 1 and 2 below).

The structure of the “wire end stripping inspection apparatus” described in Patent Document 1 below will be outlined with reference to FIG. 16. This apparatus strips the insulation coating of the terminal portion of the electric wire 1 to dispose the core wire 2. In order to inspect whether the exposure operation has been performed satisfactorily, laser light is emitted from the light emitter 3 toward the light receiver 4.
When the core wire 2 of the electric wire 1 moving in the direction of the arrow in FIG. 16 crosses the optical path of this laser beam, the amount of received laser beam incident on the slit 6 provided on the light receiving surface 5 of the light receiver 4 decreases. To do.

FIG. 17 shows a temporal change in the detection voltage according to a change in the amount of received light incident on the slit 6, where the region 1 is a state before the core wire 2 crosses the optical path of the laser beam, and the region 2 is the laser beam in the core wire 2 The state where the optical fiber has started to cross the optical path and the region 3 correspond to the state in which the core 2 is in the process of crossing the optical path of the laser light.
In the apparatus shown in FIG. 16, when the state in which the detection voltage VD in the region 3 is between the first reference value VH and the second reference value VL continues for a predetermined time, the skinning process is performed well. judge.

JP-A-6-225423 Japanese Patent No. 2651305

By the way, in order to remove the insulation coating from the end portion of the electric wire 1 and expose the core wire 2, various states may occur as shown in FIG. .
That is, FIG. 18A shows a state in which the removal operation has been performed satisfactorily, and the core wire 2 is exposed and has no defect.
On the other hand, in the state of FIG. 18B, the insulating coating 1a remains, and in the state of FIG. 18C, the core wire 2 is completely cut by the strip blade.
Further, in the state of FIG. 18D, the upper core wire 2a remains among the plurality of strands constituting the core wire 2, but the lower strand 2b is missing, and the state of FIG. Then, both the upper and lower strands 2a and 2b are missing.
Therefore, in addition to the function of detecting whether or not the insulation coating 1a has been removed, the device for inspecting whether or not the work for removing the insulation coating has been performed successfully has a defect in the exposed core wire 2. A function for detecting whether or not there is also required.

In addition, the electric wire to be inspected is generally composed of 7 to 19 strands, and has a structure in which the remaining strands are spirally wound around one central strand.
As an example of such an electric wire, the electric wire shown in FIG. 19A has a structure in which six strands are arranged at equal intervals of 60 degrees in the circumferential direction around one central strand. .
At this time, the conventional apparatus shown in FIG. 16 is of a type in which inspection is performed using laser light irradiated along one optical axis.
Accordingly, when the width of the portion where the irradiated laser beam is blocked by the core wire 2 as shown in FIG. 19A is referred to as “light blocking width”, the lower element as shown in FIG. Even when the lines 2b, 2b ', 2d are lost, or when the upper strands 2a, 2a', 2c are lost as shown in FIG.
Similarly, when the angle position of the core wire 2 is changed as shown in FIG. 20A, the lower strands 2b ′ and 2d are lost as shown in FIG. As shown in (c), there is no change in the light shielding width even when the upper strands 2a and 2c are lost.
Therefore, the conventional apparatus shown in FIG. 16 can inspect whether or not the insulation coating 1a at the end of the electric wire has been removed, but cannot inspect whether or not the core wire is missing.

Further, the conventional apparatus shown in FIG. 16 determines whether or not the insulation coating 1a of the wire terminal portion has been removed based on the relationship between the detection voltage VD and the first reference value VH and the second reference value VL. is there.
For this reason, it is necessary to set the first reference value VH and the second reference value VL that are determination criteria, but as described above, the light shielding width changes depending on the angular position of the core wire.
Accordingly, it is necessary to set a determination standard by inspecting a large number of electric wires whose core wires are not missing, and the setting work is complicated.

Further, in the conventional apparatus shown in FIG. 16, when dust or the like adheres to the lenses and filters of the light emitter 3 and the light receiver 4, the light projection amount and the light reception amount are reduced and the detection voltage VD is lowered.
At this time, since the conventional apparatus shown in FIG. 16 uses a laser beam irradiated along one optical axis, whether the decrease in the detection voltage VD is caused by a change in the light shielding width, dust or the like It is difficult to discriminate whether it is due to the adhesion of the light source or the irradiation intensity of the laser beam, and the work of maintaining and inspecting the light emitter 3 and the light receiver 4 becomes complicated.

  Therefore, the object of the present invention is not only to solve the above-described problems of the prior art, but also to reliably inspect whether or not there is a defect in the core wire constituting the core wire exposed at the end of the electric wire. It is an object of the present invention to provide a core wire inspection device for an end portion of an electric wire, which can easily set a reference and can reduce labor of maintenance and inspection work.

The means described in claim 1 for solving the above problem is
For the electric wire including the core wire in which six strands are arranged at an equal angle in the circumferential direction around one central strand, the core wire exposed by removing the insulation coating of the end portion of the wire A device for inspecting for the presence or absence of a defect in the core wire by irradiating with laser light,
Laser light irradiation means for irradiating laser light in the vertical direction, diagonally forward direction and diagonally rearward direction toward the core wire that extends in the longitudinal direction while extending in the lateral direction;
Laser light receiving means for receiving the laser light emitted from each of these laser light emitting means and outputting a detection voltage corresponding to the amount of light received;
Determination means for determining the quality of the core wire based on the received light amount corresponding to the detection voltage obtained from each of these laser light receiving means and a determination criterion;
Equipped with a,
The laser beams irradiated in the diagonally forward direction and the diagonally backward direction are respectively arranged so as to form an equal angle with each other when viewed from the horizontal direction with respect to the laser beam irradiated in the vertical direction ,
The equal angle is 37.5 degrees to 52.5 degrees .

The optical axes of the laser beams emitted from the laser beam irradiation means can be arranged on a single plane extending in the front-rear and up-down directions, or can be arranged with their positions shifted in the left-right direction. The position can be shifted in the direction.
Also, irradiate one of the laser beams from directly above and below the core wire, and irradiate the remaining laser beams obliquely from the upper front and from the upper rear of the core diagonally downward, or the remaining laser light to the core wire. On the other hand, it is also possible to irradiate obliquely upward from obliquely lower front and obliquely rear lower.
In addition, a plurality of laser beams can be irradiated obliquely forward or obliquely rearward.

That is, the core wire inspection device for the wire terminal portion according to the present invention inspects the core wire from a plurality of directions using laser beams irradiated along a plurality of optical axes that form angles with each other.
Thereby, when any of the plurality of strands constituting the core wire is missing, any of the laser beams can be detected as a decrease in the light shielding width blocked by the core wire. It is possible to reliably inspect whether there is a defect in the core wire exposed to the wire.

Further, the optical axes of the laser beams irradiated in the diagonally forward direction and the diagonally backward direction are symmetric in the front-rear direction with respect to the optical axes of the laser beams irradiated in the vertical direction.
As a result, when the strands constituting the core wire to be inspected are arranged symmetrically in the front-rear direction, the laser beam irradiation means is arranged at an optimal angular position according to the cross-sectional shape, and this core wire is It is possible to reliably detect defects in the constituent wires.

In addition, when inspecting an electric wire in which six strands are arranged at an equal angle in the circumferential direction around one central strand, the laser beam irradiated in the vertical direction is irradiated in an oblique direction. If the laser beams are arranged at an angle of 37.5 ° to 52.5 °, preferably 45 ° with respect to each other, the strands constituting the core wire overlap each other in the optical axis direction of each laser beam. Can be minimized.
Thereby, it can be reliably inspected within a necessary range as to whether or not the core wire exposed at the electric wire terminal portion has a defect.

The means described in claim 5 for solving the above problem is as follows.
For the electric wire including the core wire in which six strands are arranged at an equal angle in the circumferential direction around one central strand, the core wire exposed by removing the insulation coating of the end portion of the wire A device for inspecting for the presence or absence of a defect in the core wire by irradiating with laser light,
Laser light irradiation means for irradiating laser light in the vertical direction, diagonally forward direction and diagonally rearward direction toward the core wire that extends in the longitudinal direction while extending in the lateral direction;
Laser light receiving means for receiving the laser light emitted from each of these laser light emitting means and outputting a detection voltage corresponding to the amount of light received;
Determination means for determining the quality of the core wire based on the received light amount corresponding to the detection voltage obtained from each of these laser light receiving means and a determination criterion;
With
The laser light irradiation means includes a first laser light irradiation means arranged on the front side in the direction in which the core wire moves, and a first laser light irradiation means arranged behind the first laser light irradiation means in the direction in which the core wire moves. 2 laser light irradiation means,
In the first laser beam irradiation means, the laser beams irradiated in the obliquely forward direction and the obliquely backward direction are equal to each other when viewed from the left and right directions with respect to the laser beam irradiated in the vertical direction. Are arranged to form an angle of 1,
In the second laser beam irradiating means, the laser beam irradiated in the diagonally forward direction and the diagonally backward direction is the first when the laser beam irradiated in the vertical direction is viewed from the left-right direction. Are arranged so as to form second angles that are larger than and equal to each other,
The first angle is 45 degrees, and the second angle is 67.5 degrees.

That is, according to the core wire inspection device of the electric wire terminal portion described in claim 5, even if it is not possible to detect the presence or absence of a broken wire in the front core wire inspection device, in the rear core wire inspection device, at different angles. Since it is possible to inspect whether or not the strands are broken by the irradiated laser light, it is possible to reliably inspect all the strands constituting the core wire exposed at the end of the electric wire for defects. be able to.

The means described in claim 6 for solving the above-mentioned problem is:
For the electric wire including the core wire in which six strands are arranged at an equal angle in the circumferential direction around one central strand, the core wire exposed by removing the insulation coating of the end portion of the wire A device for inspecting for the presence or absence of a defect in the core wire by irradiating with laser light,
Laser light irradiation means for irradiating laser light in the vertical direction, diagonally forward direction and diagonally rearward direction toward the core wire that extends in the longitudinal direction while extending in the lateral direction;
Laser light receiving means for receiving the laser light emitted from each of these laser light emitting means and outputting a detection voltage corresponding to the amount of light received;
Determination means for determining the quality of the core wire based on the received light amount corresponding to the detection voltage obtained from each of these laser light receiving means and a determination criterion;
With
The laser beam irradiation means is
A first laser beam irradiated in the vertical direction;
A second laser beam and a third laser beam that are irradiated obliquely forward and obliquely at the same first angle when viewed from the left-right direction with respect to the first laser beam;
A fourth laser beam irradiated obliquely at a second angle greater than the first angle when viewed from the left-right direction with respect to the first laser beam;
Are each configured to irradiate
The first angle is 37.5 degrees or 45 degrees, and the second angle is 67.5 degrees.

That is, the core wire inspection apparatus according to claim 6 inspects the core wire by using a plurality of laser beams irradiated obliquely at different angles with respect to the optical axis of the laser beam irradiated in the vertical direction. is there.
Thereby, when any of the plurality of strands constituting the core wire is missing, it is possible to further increase the probability that any laser light can be detected as a reduction in the light shielding width that is blocked by the core wire. It is possible to more reliably inspect whether or not the core wire exposed at the electric wire terminal portion has a defect.

  According to the present invention, it is possible not only to reliably inspect whether there is a defect in the core wire exposed on the electric wire terminal portion, but also to easily set the determination criteria, and to reduce the labor of maintenance inspection work. A core wire inspection apparatus can be provided.

Hereinafter, with reference to FIGS. 1-14, each embodiment of the core wire test | inspection apparatus of the electric wire terminal part which concerns on this invention is described in detail.
In the following description, the direction in which the wire to be inspected extends is referred to as the left-right direction, the direction in which the wire to be inspected moves is referred to as the front-rear direction, and the vertical direction is referred to as the up-down direction.

1st Embodiment First, with reference to FIGS. 1-13, the structure and operation | movement of the core wire test | inspection apparatus of 1st Embodiment are demonstrated.

The apparatus main body 10 of the core wire inspection apparatus 100 has a base portion 11a, an upper arm portion 11b, and a lower arm portion 11c, and the overall shape when viewed from the front-rear direction as shown in FIG. It is a type.
And the core wire 2 of the electric wire 1 extending horizontally in the left-right direction (the left-right direction shown in FIG. 1B) inside the gap 12 between the arm portions 11b, 11c is formed in the front-rear direction (FIG. 1A). It moves in the direction of the arrow).

The base 11a of the apparatus main body 10 includes a laser beam generating unit 13 shown in FIG. 2 and a laser beam equalizing unit 14 (splitter, mirror, etc.) for dividing the laser beam generated by the laser beam generating unit 13 into three equal parts. ) And three laser beam irradiation means (lens, filter, etc.) 15a, 15b, 15c are built in the upper arm portion 11b.
Thereby, the intensity | strength of the laser beam irradiated toward the core wire 2 from the three laser beam irradiation means 15a, 15b, 15c is mutually equal.

As shown in FIGS. 1 and 2, the laser beams irradiated from the laser beam irradiation means 15a, 15b, and 15c travel along the first to third optical axes 16, 17, and 18, respectively. It reaches three laser light receiving means (photodiodes, etc.) 19a, 19b, 19c built in the part 11c.
Each laser beam has a width in the front-rear direction of about 5 mm, which is sufficiently larger than the diameter of the core wire to be inspected, and a thickness in the left-right direction of about 0.3 mm. Irradiated as a thin cross-sectional shape.

As shown in FIG. 1, the first to third optical axes 16, 17, and 18 are on one plane extending in the front-rear and up-down directions, and the first optical axis 16 extends vertically from above to below. The second optical axis 17 extends obliquely rearwardly upward and obliquely forward and downward, and the third optical axis 18 extends obliquely forwardly and upwardly to obliquely rearward and downward.
The second optical axis 17 and the third optical axis 18 intersect with each other at an angle of 45 degrees symmetrically with respect to the first optical axis 16 when viewed from the left-right direction. Yes.

The three light receiving means 19a, 19b, 19c each output a detection voltage corresponding to the amount of received laser light.
Then, the detection voltage, which is an analog signal output from the three light receiving means 19a, 19b, 19c, is converted into a digital signal representing the light reception level corresponding to the detection voltage in the A / D converter shown in FIG. Is done.
The received light level represented by the digital signal output from each A / D converter changes as shown in FIG. 3, where region 1 is the state before the core wire 2 crosses the optical path of the laser beam, and region 2 is the core wire. Region 2 corresponds to a state in which the laser beam has started to cross the optical path, region 3 corresponds to a state in which core wire 2 is in the process of crossing the optical path of laser light, and region 4 corresponds to a state in which core wire 2 exits the optical path of the laser beam. ing.

A control unit 20 shown in FIG. 2 is built in the base 11a of the core wire inspection apparatus 100.
The digital signal output from the A / D converter is input to each of the three correction units 21a, 21b, and 21c of the control unit 20, and the corresponding received light amount level is corrected there.
More specifically, the detection voltages output by the light receiving means 19a, 19b, 19c are values corresponding to the amounts of received laser light received by the light receiving means 19a, 19b, 19c.
The digital signal output from the A / D converter has a value corresponding to the detection voltage output from the light receiving means 19a, 19b, 19c, and thus the received light level.
At this time, the correcting means 21a, 21b, and 21c correct the correspondence between the digital signal input from the A / D converter and the received light amount level by, for example, uniformly adding or subtracting a numerical value corresponding to the correction amount. .

The correction control means 22 is configured so that the level of the received light amount represented by the digital signals corrected by the three correction means 21a, 21b, and 21c matches a predetermined value when each laser beam is not blocked by the core wire 2. In addition, each correction means 21a, 21b, 21c is controlled.
Thereby, when the area 1 of the graph of FIG. 3, that is, the core wire 2 does not cross the optical path of the laser beam, the levels of the received light amounts represented by the three digital signals are equal.

The digital signals whose received light amount levels are corrected by the three correction units 21 a, 21 b, and 21 c are input to the maximum value / minimum value detection unit 23.
At this time, if the core wire 2 moves forward in the transport direction and blocks the optical path of the laser light, the received light amount level represented by the digital signal input to the maximum value / minimum value detecting means 23 rapidly decreases (area of the graph in FIG. 3). 2).
When the received light amount level represented by at least one of the three digital signals falls below a predetermined value c% with respect to the received light amount level in the region 1, the maximum value / minimum value detection unit 23 is notified. The included trigger detection means (not shown) detects this drop and activates the sampling function.
Then, the maximum value / minimum value detection means 23 outputs the input three digital signals at a predetermined time while the core wire 2 moves forward and completely blocks the optical path of the laser beam (area 3 in the graph of FIG. 3). Sampling is performed a predetermined number of times, and information on the amount of received light is buffered.
Then, the maximum value and the minimum value of the received light amount level are detected based on the buffered data, and are output to the determination reference setting unit 24 and the determination unit 25, respectively.

The criterion setting means 24 sets an allowable range as shown in FIG. 3 based on the maximum value and the minimum value of the received light amount level obtained by inspecting the non-defective core wire 2 having no defect in the element wire. .
That is, the upper limit of the received light amount is calculated by adding the value of a% to the maximum value of the received light amount obtained by inspecting the non-defective core wire 2, and obtained by inspecting the non-defective core wire 2. The lower limit light reception amount is calculated by subtracting the b% value from the minimum value of the light reception amount. Thus, the allowable range (determination criterion) is between the upper limit light reception amount level and the lower limit light reception amount level.

The judgment level input means 26 inputs the values of a% and b% used for calculating the upper and lower received light amounts to the judgment reference setting means 24, respectively.
Thereby, for example, when changing the dimension or type of the electric wire 1 or when changing the bending correction level of the electric wire 1, the determination criterion can be set appropriately.

  The determination means 25 is when both the maximum value / minimum value output from the maximum value / minimum value detection means 23 in the inspection of the core wire 2 of the electric wire 1 that is the product to be inspected are within the allowable range. A pass determination signal is output to the output, and when either or both are not within the allowable range, a fail determination signal is output.

Next, a product inspection using the core wire inspection apparatus 100 of the first embodiment will be described with reference to FIGS.
In this product inspection, the apparatus is first inspected, then a determination standard (allowable range) is set using a non-defective wire, and then the product is inspected.

In the core wire inspection apparatus 100 according to the first embodiment, the laser light generated by one laser light generating means 13 is equally divided into three by the laser light equal distribution means 14 and three laser light irradiation means 15a, 15b, 15c. Is distributed.
Thereby, since the intensity of the laser beam irradiated to the core wire 2 along the three optical axes 16, 17, 18 from the three laser beam irradiation means 15a, 15b, 15c is equal to each other, the core wire 2 transmits each laser beam. In the unshielded state, that is, the state of the region 1 in FIG. 3, the received light amount levels represented by the digital signals respectively input to the maximum value / minimum value detecting means 23 should be equal.
However, when there is a deviation in the received light level represented by these digital signals, the correction control means 22 performs three corrections as shown in steps (hereinafter referred to as S) 1 to S4 of the flowchart shown in FIG. The digital signals input to the maximum value / minimum value detection means 23 from the respective correction means 21a, 21b, 21c in a state where the operation of the means 21a, 21b, 21c is controlled respectively and the core wire 2 does not block each laser beam are represented. Make the received light level equal.

In addition, since such an inspection is performed automatically and continuously while the inspection of the core wire 2 is not performed, it is not necessary for the operator to adjust before starting the inspection of the core wire 2.
In addition, dust or the like adhered to any of the laser light irradiation means 15a, 15b, 15c or the laser light receiving means 19a, 19b, 19c during the inspection, and the received light amount level represented by the digital signal output therefrom decreased. In this case, since the received light amount level can be corrected by the correcting means to which the digital signal is input, the inspection accuracy of the core wire can always be kept high.

Next, as shown in the flowchart of FIG. 5, a non-defective wire 1 is supplied to set a determination criterion (allowable range).
More specifically, when a good wire 1 is supplied as shown in S11 of the flowchart of FIG. 5 and the core wire 2 blocks the optical path of the laser light, three values input to the maximum value / minimum value detecting means 23 are input. The received light amount level represented by the digital signal should drop sharply (region 2 in the graph of FIG. 3).
However, in the determination step of S12, if it is determined that the decrease in the received light amount level is smaller than the predetermined value (c%), an abnormality may occur in the inspection apparatus 100. The setting operation is stopped, and the process proceeds to S14 to inspect the inspection apparatus 100.
Then, when the inspection of the inspection apparatus 100 is completed, the good electric wire 1 is supplied again.

On the other hand, if it is determined in step S12 that the decrease in the amount of received light is greater than a predetermined value (c%), the trigger detection means included in the maximum value / minimum value detection means 23 will reduce this decrease. Detect and activate the sampling function (S15).
Then, the maximum value / minimum value detecting means 23 samples the three input digital signals a predetermined number of times within the predetermined time range in the region 3 described above, and buffers the data relating to the received light amount level (S16).
Thereafter, the maximum value / minimum value detecting means 23 detects the maximum value and the minimum value of the amount of received light based on the buffered data, and outputs them to the determination criterion setting means 24 (S17).
Next, when the worker performing the inspection operation inputs the values of a% and b%, which are allowable values, in accordance with the size and type of the electric wire 1 to be inspected or the bending correction level (S18), the determination criterion setting means 24 Determination criteria (allowable range) as shown in FIG. 3 are set (S19).
Thereby, the setting of the determination standard (allowable range) is completed, and the product inspection can be started by sequentially supplying the electric wires of the products to be inspected.

When the product is inspected, the electric wire 1 to be inspected is supplied as shown in S21 of the flowchart of FIG.
Then, when the core wire 2 blocks the optical path of the laser light, the received light amount level represented by the three digital signals input to the maximum value / minimum value detection means 23 should drop sharply (region 2 in the graph of FIG. 7). ).
However, in the determination step of S22, if it is determined that the decrease in the received light amount level is smaller than the predetermined value (c%), there is a possibility that an abnormality has occurred in the inspection apparatus 100. The setting operation is stopped, and the process proceeds to S24 to inspect the inspection apparatus 100.
When the inspection of the inspection apparatus 100 is completed, the electric wire 1 to be inspected is supplied.

On the other hand, if it is determined in step S22 that the decrease in the amount of received light is greater than a predetermined value (c%), the trigger detection means included in the maximum value / minimum value detection means 23 reduces this decrease. Detect and activate the sampling function (S25).
Then, the maximum value / minimum value detection means 23 samples the three input digital signals a predetermined number of times within the predetermined time range in the region 3 described above, and buffers the data regarding the received light amount level (S26).
Then, the maximum value / minimum value detection means 23 detects the maximum value and the minimum value of the amount of received light based on the buffered data (S27), and outputs them to the determination means 25.
Then, the determination unit 25 determines the maximum value and the minimum value of the amount of received light input from the maximum value / minimum value detection unit 23 (S28), and if it is within the determination standard (allowable range), it passes a pass determination signal. Output (S29), and if it is not within the determination criteria (allowable range), output a failure determination signal (S30).

  By the way, as shown in FIGS. 8 to 13, when the electric wire 1 has six strands arranged at equal angles in the circumferential direction around one central strand, each laser beam Depending on the angle formed by the optical axes 16, 17, and 18, it may not be possible to detect defects in the strands that make up the core wire 2.

More specifically, when the angle formed by the optical axes 16, 17, and 18 is set to 30 degrees as shown in FIG. 8, when the core wire 2 is at the angular position shown in FIG. By detecting the light-shielding width 2 of the laser light along the axis 17, it is possible to detect defects in the strands 2a and 2b '(circled).
Similarly, by detecting the light blocking width 3 of the laser light along the optical axis 18, it is possible to detect the loss of the strands 2a 'and 2b.
However, since the uppermost strand 2c and the lowermost strand 2d overlap with other strands in the direction of the optical axes 16, 17, and 18, the defect cannot be detected (x is attached). ).

Further, when the core wire 2 is at the angular position shown in FIG. 8B, the loss of the strands 2a ′ and 2b can be detected by detecting the light shielding width of the laser light along the optical axis 16.
However, since the strands 2a, 2c, 2d, and 2b 'overlap with other strands in the direction of the optical axes 17 and 18, it is not possible to detect the defect.

  Therefore, when the angle formed by each of the optical axes 16, 17, 18 is set to 30 degrees, the missing core wire marked with “x” in FIG. 8 is detected among the strands constituting the core wire 2. I can't.

On the other hand, when the angle formed by the optical axes 16, 17, and 18 is set to 37.5 degrees as shown in FIG. 9, when the core wire 2 is at the angular position shown in FIG. By detecting the light shielding width 2 of the laser light along the optical axis 17, it is possible to detect defects in the strands 2a and 2b '.
Similarly, by detecting the light blocking width 3 of the laser light along the optical axis 18, it is possible to detect the loss of the strands 2a 'and 2b.
However, since the uppermost strand 2c and the lowermost strand 2d overlap with other strands in any direction of the optical axes 16, 17, and 18, the defect cannot be detected.

Further, when the core wire 2 is at the angular position shown in FIG. 9B, the loss of the strands 2a 'and 2b can be detected by detecting the light shielding width 1 of the laser light along the optical axis 16. .
Similarly, by detecting the light shielding width 2 of the laser light along the optical axis 17, it is possible to detect the loss of the strands 2a and 2b ′.
Further, by detecting the light shielding width 3 of the laser light along the optical axis 18, it is possible to detect the loss of the strands 2c and 2d.

  Therefore, when the angle formed by the optical axes 16, 17, and 18 is set to 37.5 degrees, the uppermost strand 2c and the lowermost strand 2d are excluded at the angular position shown in FIG. 9A. It is possible to detect defects in other strands.

Further, when the angle formed by the optical axes 16, 17, and 18 is set to 45 degrees as shown in FIG. 10, when the core wire 2 is at the angular position shown in FIG. By detecting the light shielding width 2 of the laser beam, it is possible to detect defects in the strands 2a and 2b '.
Similarly, by detecting the light blocking width 3 of the laser light along the optical axis 18, it is possible to detect the loss of the strands 2a 'and 2b.
However, since the uppermost strand 2c and the lowermost strand 2d overlap with other strands in any direction of the optical axes 16, 17, and 18, the defect cannot be detected.

Further, when the core wire 2 is at the angular position shown in FIG. 10B, the loss of the strands 2a ′ and 2b can be detected by detecting the light shielding width 1 of the laser light along the optical axis 16. .
Similarly, the loss of the strands 2a and 2b 'can be detected by detecting the light shielding width 2 of the laser light along the optical axis 17.
Further, by detecting the light shielding width 3 of the laser light along the optical axis 18, it is possible to detect the defects of the strands 2c and 2d.

  Therefore, when the angle formed by each of the optical axes 16, 17, 18 is set to 45 degrees, except for the uppermost strand 2c and the lowermost strand 2d at the angular position in FIG. It is possible to detect a deficiency of the element wire.

Further, when the angle formed by each of the optical axes 16, 17, and 18 is set to 52.5 degrees as shown in FIG. 11, when the core wire 2 is at the angular position shown in FIG. By detecting the light shielding width 2 of the laser beam along the line, it is possible to detect the loss of the strands 2a and 2b '.
Similarly, by detecting the light blocking width 3 of the laser light along the optical axis 18, it is possible to detect the loss of the strands 2a 'and 2b.
However, since the uppermost strand 2c and the lowermost strand 2d overlap with other strands in any direction of the optical axes 16, 17, and 18, the defect cannot be detected.

Further, when the core wire 2 is at the angular position shown in FIG. 11B, the loss of the strands 2a ′ and 2b can be detected by detecting the light shielding width 1 of the laser light along the optical axis 16. .
Similarly, by detecting the light shielding width 2 of the laser light along the optical axis 17, it is possible to detect the loss of the strands 2a and 2b ′.
Further, by detecting the light shielding width 3 of the laser light along the optical axis 18, it is possible to detect the loss of the strands 2c and 2d.

  Therefore, when the angle formed by the optical axes 16, 17, and 18 is set to 52.5 degrees, the uppermost strand 2c and the lowermost strand 2d are excluded at the angular position of FIG. It is possible to detect defects in other strands.

  Furthermore, when the angle formed by each of the optical axes 16, 17, and 18 is set to 60 degrees as shown in FIG. 12, when the core wire 2 is at the angular position shown in FIG. Since the strands 2a, 2a ′, 2b, 2b ′, 2c, and 2d overlap each other in the directions 16, 17, and 18, they cannot be detected.

  Further, when the core wire 2 is at the angular position shown in FIG. 12B, the loss of the strands 2a ′ and 2b can be detected by detecting the light shielding width of the laser light along the optical axis 16, By detecting the light shielding width 2 of the laser light along the optical axis 17, it is possible to detect defects in the strands 2a and 2b ', and by detecting the light shielding width 3 of the laser light along the optical axis 18, It is possible to detect defects in the strands 2c and 2d.

  Therefore, when the angle formed by the optical axes 16, 17, 18 is set to 60 degrees, if the core wire 2 is at the angular position shown in FIG. , 2a ′, 2b, 2b ′, 2c, 2d cannot be detected.

In addition, when the angle formed by the optical axes 16, 17, and 18 is set to 67.5 degrees as shown in FIG. 13, when the core wire 2 is at the angular position shown in FIG. By detecting the light shielding width 2 and the light shielding width 3 of the laser light along the optical axis 17 and the optical axis 18, it is possible to detect a defect in the uppermost element wire 2c and the lowermost element wire 2d in FIG. it can.
However, since the strands 2a, 2a ', 2b, 2b' in FIG. 13 (a) overlap with each other in the direction of all the optical axes 16, 17, and 18, they are detected. I can't.

  Further, when the core wire 2 is at the angular position shown in FIG. 13B, the loss of the strands 2a ′ and 2b can be detected by detecting the light shielding width of the laser light along the optical axis 16, By detecting the light shielding width 2 of the laser light along the optical axis 17, it is possible to detect defects in the strands 2a and 2b ', and by detecting the light shielding width 3 of the laser light along the optical axis 18, It is possible to detect defects in the strands 2c and 2d.

  Therefore, when the angle formed by the optical axes 16, 17, and 18 is set to 67.5 degrees, if the core wire 2 is at the angular position shown in FIG. 13A, the surrounding strands 2a, 2a ′, The deficiency of 2b and 2b ′ cannot be detected.

At this time, the core wire inspection apparatus 100 of the first embodiment inspects the core wire 2 in which six strands are arranged at an equal angle in the circumferential direction around one central strand. Thus, the optical axes 17 and 18 of the laser light irradiated obliquely forward and backward respectively form 45 degrees when viewed from the left and right directions with respect to the optical axis 16 of the laser light irradiated vertically. As described above, laser light irradiation means 14a, 14b, and 14c are provided.
Thereby, it is possible to minimize the state in which the strands constituting the core wire 2 overlap in the direction of the optical axes 16, 17 and 18 of the respective laser beams.

If the core wire 2 is at the angular position shown in FIG. 10A, it is impossible to detect a defect in the uppermost strand 2c and the lowermost core wire 2d.
However, when these strands 2c and 2d are missing due to the structure of the strip blade used for stripping the insulation coating of the wire terminal portion, the adjacent strands 2a, 2a ', 2b and 2b' are also missing.
Therefore, according to the core wire inspection apparatus 100 of the first embodiment, whether or not the core wire 2 exposed at the terminal portion of the electric wire 1 is defective can be reliably inspected within a necessary range.

  Further, in the core wire inspection device 100 of the first embodiment, the angle formed by the optical axes 16, 17, and 18 of the laser light is set to 45 degrees. However, as shown in FIG. Even if the angle formed between the axes 16, 17, and 18 is 37.5 degrees, or the angle formed between the optical axes 16, 17, and 18 of the laser beam is 52.5 degrees as shown in FIG. An effect can be obtained.

2nd Embodiment Next, with reference to FIG. 14, the core wire test | inspection apparatus of the electric wire terminal part of 2nd Embodiment is demonstrated.

The core wire inspection device 200 is a device in which two core wire inspection devices of the type of the first embodiment described above are arranged in the front-rear direction, and the front core wire inspection device is the above-described core wire inspection device 100 itself, and the rear side. In the core wire inspection apparatus 30, the angle formed by the optical axes 16, 17 and 18 is set to 67.5 degrees.
The core wire 2 to be inspected is first inspected by the front core wire inspection device 100 while moving forward (rightward in the figure in FIG. 13) with its angular position fixed, and then the rear core wire inspection. Inspected by device 30.

At this time, in the front core wire inspection apparatus 100 in which the angle formed by each of the optical axes 16, 17, 18 is set to 45 degrees, as shown in FIG. 2d was present.
On the other hand, in the rear core wire inspection apparatus 30, the angle formed by the optical axes 16, 17, and 18 is set to 67.5 degrees, so that the strands 2c and 2d as shown in FIG. The presence or absence of deficiency can be detected.
Therefore, according to the core wire inspection device 200 of the second embodiment in which the front core wire inspection device 100 and the rear core wire inspection device 30 are combined, 6 is disposed around one central strand. It is possible to reliably detect the presence / absence of all defects in the strands 2a, 2a ′, 2b, 2b ′, 2c, and 2d.

3rd Embodiment Next, with reference to FIG. 15, the core wire test | inspection apparatus of the electric wire terminal part of 3rd Embodiment is demonstrated.

  This core wire inspection device 300 is a further improvement of the above-described core wire inspection device according to the second embodiment. Laser light irradiated in the vertical direction along the optical axis 16 and 37 in the front-rear direction with respect to the optical axis 16 are respectively provided. Laser light irradiated along optical axes 17 and 18 forming an angle of 5 degrees, and laser light irradiated along optical axis 18 'forming an angle of 67.5 degrees forward with respect to the optical axis 16 In total, four laser beams are used.

That is, in the core inspection apparatus in which the angle formed by each of the optical axes 16, 17, and 18 is set to 37.5 degrees, the strands 2c and 2d that cannot detect the deficiency as shown in FIG. Were present.
On the other hand, when laser light irradiated along the optical axis 18 'that forms an angle of 67.5 degrees with respect to the optical axis 16 extending in the vertical direction is used, the strands 2c, The presence or absence of 2d deficiency can be detected.
Therefore, according to the core wire inspection device 300 of the third embodiment, all of the six strands 2a, 2a ′, 2b, 2b ′, 2c, and 2d arranged around one central strand. The presence or absence of deficiency can be detected.

In the third embodiment, the angles formed by the optical axes 16, 17 and 18 are set in order to secure an installation space for the additional laser beam irradiation means for the laser beam having an angle of 67.5 degrees. Although it is set to 37.5 degrees, it can also be set to form 45 degrees.
Further, although laser light having an angle of 67.5 degrees with respect to the optical axis 16 is disposed only on the front side of the optical axis 16, it is also disposed on the front side of the optical axis 16 for a total of five laser beams. Can also be used.
In this case, each laser is irradiated so that the laser beam irradiated at an angle of 67.5 degrees with respect to the optical axis 16 is irradiated from the lower side of the core wire 2 toward the upper front side and the upper rear side. Light irradiation means can also be arranged.
Needless to say, the laser light generated by one laser light generation means is equally divided and guided to laser light irradiation means for irradiating these laser lights.

As mentioned above, although each embodiment of the test | inspection apparatus of the electric wire terminal processing part which concerns on this invention was described in detail, it cannot be overemphasized that this invention is not limited by embodiment mentioned above and a various change is possible.
For example, in each of the above-described embodiments, the optical axis 16 is disposed so as to extend in the vertical direction (vertical direction), but on the front side or the rear side depending on the convenience of the space in which the laser beam irradiation means is disposed. It can also be tilted.

The front view (a) and side view (b) which show the core wire test | inspection apparatus of 1st Embodiment. The block diagram which shows the structure of the core wire test | inspection apparatus shown in FIG. The graph figure which shows the change of the signal level when a non-defective product is inspected, and the setting of the allowable range. The flowchart which shows the procedure which correct | amends the level of received light quantity. The flowchart which shows the procedure which sets an allowable range. The flowchart which shows the procedure of product inspection. The graph which shows the change of the light reception amount in the case of product inspection. The figure which shows the relationship of the angle position of the irradiation angle of a laser beam, and a core wire. The figure which shows the relationship of the angle position of the irradiation angle of a laser beam, and a core wire. The figure which shows the relationship of the angle position of the irradiation angle of a laser beam, and a core wire. The figure which shows the relationship of the angle position of the irradiation angle of a laser beam, and a core wire. The figure which shows the relationship of the angle position of the irradiation angle of a laser beam, and a core wire. The figure which shows the relationship of the angle position of the irradiation angle of a laser beam, and a core wire. The front view which shows the core wire test | inspection apparatus of 2nd Embodiment. The figure which shows the relationship between the irradiation angle degree of the laser beam and the angle position of a core wire in the core wire inspection apparatus of 3rd Embodiment. The figure which shows the test | inspection apparatus currently disclosed by Unexamined-Japanese-Patent No. 6-225423. The graph which shows the change of the voltage signal obtained in the inspection apparatus of FIG. The figure which shows the various defects of an electric wire terminal process. The figure which shows the problem in the inspection apparatus of FIG. The figure which shows the problem in the inspection apparatus of FIG.

DESCRIPTION OF SYMBOLS 1 Electric wire 2 Core wire 3 Light emitter 4 Light receiver 5 Light receiving surface 6 Slit 13 Laser light generation means 14 Laser light equal distribution means 15 Laser light irradiation means 16, 17, 18, 18 'Optical axis 19 Light reception means 20 Control part 21 Correction means 22 Correction control means 23 Maximum value / minimum value detection means 24 Judgment reference setting means 25 Judgment means 26 Judgment level input means 30 Inspection apparatus 100 on the rear side Core wire inspection apparatus 200 of the wire terminal section of the first embodiment Electric wire terminal unit core wire inspection apparatus 300 Electric wire terminal unit core wire inspection apparatus of the third embodiment

Claims (6)

For the electric wire including the core wire in which six strands are arranged at an equal angle in the circumferential direction around one central strand, the core wire exposed by removing the insulation coating of the end portion of the wire A device for inspecting for the presence or absence of a defect in the core wire by irradiating with laser light,
Laser light irradiation means for irradiating laser light in the vertical direction, diagonally forward direction and diagonally rearward direction toward the core wire that extends in the longitudinal direction while extending in the lateral direction;
Laser light receiving means for receiving the laser light emitted from each of these laser light emitting means and outputting a detection voltage corresponding to the amount of light received;
Determination means for determining the quality of the core wire based on the received light amount corresponding to the detection voltage obtained from each of these laser light receiving means and a determination criterion;
Equipped with a,
The laser beams irradiated in the diagonally forward direction and the diagonally backward direction are respectively arranged so as to form an equal angle with each other when viewed from the horizontal direction with respect to the laser beam irradiated in the vertical direction ,
The said equal angle is 37.5 degree | times-52.5 degree | times, The core wire test | inspection apparatus of the electric wire terminal part characterized by the above-mentioned . The said same angle is 37.5 degree | times, The core wire test | inspection apparatus of the electric wire terminal part described in Claim 1 characterized by the above-mentioned. The said same angle is 45 degree | times, The core wire test | inspection apparatus of the electric wire terminal part described in Claim 1 characterized by the above-mentioned. The said same angle is 52.5 degree | times, The core wire test | inspection apparatus of the electric wire terminal part described in Claim 1 characterized by the above-mentioned. For the electric wire including the core wire in which six strands are arranged at an equal angle in the circumferential direction around one central strand, the core wire exposed by removing the insulation coating of the end portion of the wire A device for inspecting for the presence or absence of a defect in the core wire by irradiating with laser light,
Laser light irradiation means for irradiating laser light in the vertical direction, diagonally forward direction and diagonally rearward direction toward the core wire that extends in the longitudinal direction while extending in the lateral direction;
Laser light receiving means for receiving the laser light emitted from each of these laser light emitting means and outputting a detection voltage corresponding to the amount of light received;
Determination means for determining the quality of the core wire based on the received light amount corresponding to the detection voltage obtained from each of these laser light receiving means and a determination criterion;
With
The laser light irradiation means includes a first laser light irradiation means arranged on the front side in the direction in which the core wire moves, and a first laser light irradiation means arranged behind the first laser light irradiation means in the direction in which the core wire moves. 2 laser light irradiation means,
In the first laser beam irradiation means, the laser beams irradiated in the obliquely forward direction and the obliquely backward direction are equal to each other when viewed from the left and right directions with respect to the laser beam irradiated in the vertical direction. Are arranged to form an angle of 1,
In the second laser beam irradiating means, the laser beam irradiated in the diagonally forward direction and the diagonally backward direction is the first when the laser beam irradiated in the vertical direction is viewed from the left-right direction. Are arranged so as to form second angles that are larger than and equal to each other,
The first end angle is 45 degrees, and the second angle is 67.5 degrees. For the electric wire including the core wire in which six strands are arranged at an equal angle in the circumferential direction around one central strand, the core wire exposed by removing the insulation coating of the end portion of the wire A device for inspecting for the presence or absence of a defect in the core wire by irradiating with laser light,
Laser light irradiation means for irradiating laser light in the vertical direction, diagonally forward direction and diagonally rearward direction toward the core wire that extends in the longitudinal direction while extending in the lateral direction;
Laser light receiving means for receiving the laser light emitted from each of these laser light emitting means and outputting a detection voltage corresponding to the amount of light received;
Determination means for determining the quality of the core wire based on the received light amount corresponding to the detection voltage obtained from each of these laser light receiving means and a determination criterion;
With
The laser beam irradiation means is
A first laser beam irradiated in the vertical direction;
A second laser beam and a third laser beam that are irradiated obliquely forward and obliquely at the same first angle when viewed from the left-right direction with respect to the first laser beam;
A fourth laser beam irradiated obliquely at a second angle greater than the first angle when viewed from the left-right direction with respect to the first laser beam;
Are each configured to irradiate
The core wire inspection device for a wire terminal portion, wherein the first angle is 37.5 degrees or 45 degrees, and the second angle is 67.5 degrees.

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