JPH1123226A - Inspection device for covered conductor with cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable inspection device as a sensor which detects the defectively attached cap of a covered conductor and defectively stripped-off cover of the conductor when the conductor is incorporated in an automatic machine for caulking terminal fittings immediately after the cover of the conductor is stripped off from the end section of the conductor and moved at a high speed in an oscillating state. SOLUTION: When the passage of a covered conductor with cap moving at a high speed is detected by means of an optical sensor 12 for detecting synchronization, the binary picture of the shade of the end section of the conductor is obtained by opening an electronic shutter 13 at a high speed and taking the picture of the end section with a two-dimensional CCD sensor 14. The obtained picture data are checked for that whether or not the ends α and βof a cap are detectable and, when the ends are not detectable, it is discriminated that the cap is defectively attached. In addition, the outside diameters G and H of the cap near the end sections of the cap are measured and the orientation of the cap is detected from the ratio between the diameters G an H. The stripped-off cover of the conductor is inspected for its state by checking the ratio between the diameters LA and LB of the core 4 and cover of the conductor, crossing length L of the core across the shape, the size of a hole in the shade, and the presence of a shade further extended from the front end of the core 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus for judging whether or not a cap-attached state and a stripped-off state of a coating are carried out while feeding a covered electric wire having a cap attached to an end from which the coating has been stripped at a high speed. .

[0002]

2. Description of the Related Art In the case of using a terminal fitting attached to an end of a covered electric wire to electrically connect with a device of a counterpart, a cap is previously fitted to the end of the covered electric wire.
In some cases, the terminal fitting is connected to the counterpart terminal, and at the same time, the cap is fitted to a cap receiver provided on the counterpart device to perform waterproofing and dustproofing.

[0003] An automatic machine for processing such an insulated wire end is shown in FIG. 9 by (a) cutting the insulated wire in a fixed size,
(b) installation of the cap, (c) stripping off the edge coating, and
(d) The fixing of the terminal fittings is performed by working steps as shown in FIGS.

[0004] In FIG. 10, a cutting / cap mounting / sheath stripping position M and a crimping stop position N of a terminal fitting are provided in the middle of a straight path of the covered electric wire. The insulated wire 1 is supplied in a long state from the right side in the figure,
It is sent to the cap mounting / coat stripping position M.
Here, after being cut to a fixed size by a cutting cutter, the cap 2 is fitted, and thereafter, the stripped portion is gripped by the stripping cutter, and the end insulating coating 1a is pulled by pulling the slider that has clamped the coated electric wire 1. Peel off the skin. The insulated wire 1 from which the insulating coating 1a has been stripped is clamped by the clamper 3 and is rapidly fed to the crimping stop position N by rotation of the arm as shown in FIG. The metal fitting 5 is crimped with a press machine.

[0005] When the above-described automatic machine for insulated wires is used, as shown in Fig. 12, (a) a defective mounting position, (b) a defective without a cap, and (c) a defective orientation of the cap may occur. is there.

As shown in FIG. 13, regarding the stripping of the electric wire, (a) the coating remains, (b) (c) too much of the core wire is cut off, and (d) a cut-off for cutting the core wire as well. (E) Poor spreading of the core wire and (f) Poor whiskers may occur.

[0007] If the cap is improperly mounted or peeled, the terminal fittings will be defective even if they are mounted. Therefore, it is necessary to perform defect detection immediately after capping and peeling to remove defective products from the processing line, eliminate unnecessary processing, and prevent defective products from occurring.

Conventionally, there is no known sensor for detecting the improper mounting of the cap.

As a device for detecting a peeling defect, the present applicant has filed an application for a detector for detecting a peeling defect of a covered electric wire using a two-dimensional CCD sensor (Japanese Patent Laid-Open No. 7-198).
No. 19).

According to the present invention, the shadow of the end of the insulated wire is two-dimensional C
Photographing is performed by a CD sensor, and binarized data is subjected to program processing to detect a peeling defect.

[0011]

If there is no sensor for detecting a cap mounting defect, a defective product cannot be completely removed from the processing line even if a peeling defect is detected.

In addition, the above-described detector for detecting a defective peeling of the coated electric wire has no function of detecting (c) a partial cut-off at the tip of the core wire, (e) a defective spread of the core wire, and (f) a whisker generation defect. In addition, there was a limit in eliminating defective products.

Therefore, the present invention can detect a cap mounting defect, and at the same time, can also detect (c) a partial cut-off at the tip of the core wire, (e) a defective core wire spread, and (f) a whisker defect. To provide a device for inspecting a covered electric wire with a cap.

[0014]

[Means for Solving the Problems]

(1) According to the present invention, the end where the cap is attached is in a free state, and a fixed position is gripped by a clamper. The following configuration is provided as an inspection device for inspecting the device.

That is, a synchronous detection sensor for detecting that the covered electric wire has reached the inspection position, and at the time of this detection,
A two-dimensional CCD sensor that opens an electronic shutter and captures an image of the end of the wire;

A binarizing circuit for binarizing the output of the two-dimensional CCD sensor and distinguishing between the caps and the ends of the electric wires serving as shadows and other portions, a still image memory for storing the binarized image, and an inspection For the covered electric wire and the cap to be used, the outer diameter E of the electric wire, the distance g ₀ from the base end α of the cap to the base side measurement part of the cap, the distance h ₀ from the tip end β of the cap to the measurement part of the end side of the cap, A setting unit that sets a displacement limit line F of the cap tip β in the direction of the covered wire tip in the image;

In the above-mentioned binarized image, the length L of the shadow in the direction orthogonal to the electric wire is measured from the clamper side of the electric wire toward the end of the electric wire, and L is the outer diameter of the electric wire E + Δ (absorbs the error. (A fixed value) A position at which the value changes from a value smaller than this to a value exceeding this is detected as the cap base end α, and a position at which L changes from a value larger than the outer diameter of the electric wire E + Δ to a value smaller than this is detected as the cap tip β. Edge detection means;

Even if the above measurement is performed up to the displacement limit line F, when neither the cap base end α nor the cap end β is detected, a cap mounting fault detecting means for outputting as no cap or poor cap position,

[0019] From the cap proximal α from the position G ₁ apart the wire end direction by the distance g _0, further between the same direction to a position G ₂ a predetermined distance g _1, in the direction perpendicular to the wire A length measuring means of a proximal measuring unit for calculating a length L of a shadow and obtaining an average length G thereof;

[0020] In between the said cap tip β from the position H ₁ apart in the clamped position the direction of the electric wire by the distance h _0, to the position H _2, further away in the same direction by a predetermined distance h _1, a direction perpendicular to the wire Of the shadow L is calculated, and the average length H
Length measuring means of the tip side measuring unit for calculating

[0021] The invention is characterized in that there is provided a cap orientation defect detecting means for comparing the average length ratio G / H with a reference value and generating a cap orientation defect output when the reference value is not satisfied.

(2) The inspection device for the cap mounting defect may detect the peeling defect at the same time. This is performed by adding the following constituent means in addition to the function of inspecting the cap mounting failure.

That is, in the above-mentioned binarized image, a setting section for setting a C line perpendicular to the electric wire near the electric wire end;
While changing the measurement position along the extending direction of the electric wire between the cap tip β and the C line, measure the length L of the shadow in a direction orthogonal to the electric wire, and the rate of change of the length exceeds a predetermined value. And a stripping boundary detecting means for detecting a maximum position as a coating stripping boundary A ', and outputting a strip failure signal when the boundary A' is not found;

With respect to the strip boundary A ', a position separated by a minute distance in the direction of the wire end is set as a B line, and a position separated by a minute distance in the direction of the clamp position is set as an A line. when the ratio L _B / L _a of the length L _a of the shadow of a-line is not within the set range for L _B, by adding a peeling failure judging means for outputting a-out bad or peeled too poor stripping, previously Mentioned (a) coating residue, (b)
(D) Detect cut-off that cuts the core wire too.

(3) The following means can be added to the basic configuration for detecting a peeling defect in the above (2).

While changing the measurement position along the extending direction of the electric wire between the cap tip β and the C line, the length L of the shadow in the direction orthogonal to the electric wire is measured, and the shadow L of each measurement line is measured. Holes through which existing light passes are counted by the number of dots of the binarized data, and when one line is counted, when the counted number exceeds a predetermined number (e), a spreading defect detection of a core wire spreading error signal is output. means

In the binarized image, the setting section sets a D line that is separated from the electric wire in the vicinity of the end of the electric wire and that is orthogonal to the direction in which the electric wire extends. When the number of dots of the digitized data is more than
(f) beard occurrence failure detection means for outputting a beard occurrence failure signal

When the ratio of the shadow length L _{C of the C} line to the shadow length L _B of the B line is not within a predetermined range, the spread of the core wire in (e) or the partial cut of the core wire in (c) is performed. Detecting means of core wire end defect output as defect

[0029]

FIG. 1 is a block diagram showing the overall configuration of an apparatus 10 for inspecting a covered electric wire with a cap according to the present invention.

Reference numeral 11 denotes a cap 2 as shown in FIG.
In a state where the end covering is stripped and the end covering is stripped, the synchronization detecting sensor 12 and the image of the end of the electric wire are photographed by the sensor unit installed at the passing position of the end of the covered electric wire 1 moving at high speed by the clamper 3. 2D CCD sensor 14, 2D C
It has a binarization circuit 15 for binarizing the output of the CD sensor. The two-dimensional CCD sensor 14 is a synchronous detection sensor 1
2 includes an electronic shutter 13 that opens instantly when an electric wire is detected.

As the synchronization detection sensor 12, a transmission type photoelectric switch is used, and its light projector 12a and light receiver 12b are
The detecting recess 1 of the U-shaped sensor case 16 shown in FIG.
7 are mounted opposite to both sides. Further, a light receiving circuit 12C for determining the presence or absence of the covered electric wire 1 based on the presence or absence of light reception.
A device having a high response time of, for example, about 20 μsec is used.

As the electronic shutter 13 of the two-dimensional CCD sensor 14, an electronic shutter 13 that can operate at a high speed of, for example, about 64 μsec is used. As shown in FIG. Mounted.

In the two-dimensional CCD sensor 14, for example, photodiodes are two-dimensionally arranged so that voltages output by the respective photodiodes in accordance with the amount of received light can be individually and sequentially taken out. In the detection recess 17, a light-emitting diode or the like is used as a light source 18 a inside the surface opposite to the surface on which the two-dimensional CCD sensor 14 is mounted, and the lens system 1.
A parallel light irradiator 18 for obtaining parallel light by 8b is incorporated. The space through which the parallel light passes becomes the detection area shown in FIG.

As shown in FIG. 3C, a backlight 18 'using a large number of light sources 18a' and a diffusion plate 25 is provided.
Accordingly, an equivalent effect can be obtained in an optical system in which the covered wire 1 and the cap are imaged by the lens 26. in this case,
If the distance between the imaging lens 26 and the insulated wire 1 fluctuates, the image becomes blurred and unclear, or the magnification fluctuates, making it impossible to determine the true wire diameter.

However, the present apparatus uses the insulated wire 1 and the two-dimensional CC
Since the D sensor 14 is mechanically positioned (the covered electric wire 1 is gripped by the clamper 2 and passes through a fixed position in the optical axis direction), an image is not blurred and detection is not difficult.

The binarization level of the binarization circuit 15 can be adjusted to an optimum value according to the surrounding brightness and the like.

Returning to FIG. 1, reference numeral 19 denotes the binarizing circuit
Data (e.g., FIG. 4, FIG. 5, FIG.
The reference numeral 20 denotes a determination unit that performs data processing, which will be described later, on the stored binarized data to determine pass / fail.

Reference numeral 21 denotes a monitor television for adjusting the mounting position of the sensor unit 11 and the like, and displays the stored still image together with the detection position of the step currently being processed and two straight lines for measuring the length. Reference numeral 22 denotes a control unit which manages the transfer of data of the entire apparatus and the timing of operation and processing. An operation panel 23 has a function of setting and selecting a judgment value according to the line type and a function of displaying various data. Reference numeral 24 denotes a setting unit that sets various set values according to the cap to be inspected and the covered electric wire by operating the operation panel 23.

The determining section 20 has a measuring section 25 for measuring the length L of the shadow of the binarized image, and performs various processes using the measured data. The determination unit 20 determines the cap end detection unit 26, the cap installation failure detection unit 27, the length measurement unit 28 of the base measurement unit, the length measurement unit 29 of the tip measurement unit, A defect detection unit 30 is provided.

In addition, regarding the inspection of the peeling failure of the coating, the determination unit 20 determines the peeling boundary detecting means 31, the peeling defective detecting means 32, the counter 33 of the number of perforated dots,
Spread failure detecting means 34, whisker occurrence failure detecting means 35,
A core wire tip failure detecting means 36 is provided.

Each processing means in the determination section 20 is constituted by a program of a microcomputer, and this operation flowchart is shown in FIG. 7 (cap mounting failure inspection).
And FIG. 8 (peeling defect inspection).

The operation of the device of the present invention will be described. As a preparation for the operation, reference data used for inspection is input. Since the position and size of the shadow on the binarized image are different as shown in FIG. 4, FIG. 5, and FIG. 6 corresponding to the covered electric wire and the cap to be inspected, this data is executed every time the inspection target is changed. .

The contents of the setting include the outer diameter E including the covering of the electric wire, the distance g ₀ from the base end α of the cap determined by the cap to be inspected to the base side measurement part, and the measurement from the tip end β of the cap to the end side. Distance to the part h ₀ ,
It is a displacement limit line F at the tip of the cap. Further, regarding the inspection of the peeling defect, in the above-mentioned binarized image, a C line perpendicular to the electric wire near the end of the electric wire, and a D line perpendicular to the extending direction of the electric wire separated from the electric wire near the end of the electric wire.

The inspection is performed as follows. The tip of the insulated wire 1 with the cap 2 fitted and peeled is
When the sensor 12 is grasped and passes through the detecting recess 17 of the sensor case 16, the synchronization detecting sensor 12 detects the light blocking state at a high speed, and opens the electronic shutter 13 for a predetermined time.
As a result, a still image with the covered electric wire 1 and the cap 2 as shadows is captured, binarized by the binarization circuit 15 and stored in the still image memory 19. This image data is displayed on the monitor television 21 as a bright and dark image as shown in FIGS.

When the binarized image is stored in the still image memory 19, the control section 22 causes the determination section 20 to execute the processing shown in FIGS.

This binarized image is light and dark bit image data. In the following description, the direction orthogonal to the electric wire is expressed in the horizontal direction, and the extending direction of the electric wire is set in the vertical direction (the upper side is defined as the end direction). Represents a series of 1-bit data in the horizontal direction as 1
Let's call it a line. This one line is, for example, CC
This corresponds to one scanning line of the D sensor.

First, the cap end detecting means 26 detects the cap base α and the cap tip β.

For example, in order to eliminate the influence of noise on the binarized image of FIG. 4, for example, the lower 10 lines in the figure are masked, and the measurement position is changed one line at a time from there. , The length L of the shadow of each line is measured.

The position at which the length L changes from a value smaller than the wire outer diameter E + Δ (fixed value for absorbing errors) to a value exceeding this value is detected as the cap base end α.

When the cap base end α is detected, a position where the length L changes from a value larger than the outer diameter E + Δ of the electric wire to a smaller value is detected as the cap tip β.

If both the cap base α and the cap tip β are not detected even after the cap end detection reaches the cap displacement limit line F, it can be determined that the cap is not fitted, and the cap base is detected. When only α is detected, it can be determined that the cap covers the point F. In this case, the cap mounting fault detecting means 27 outputs a cap-less fault (FIG. 12B) or a mounting position fault (FIG. 12A).

When the cap base α and the cap tip β are detected, the outer diameters G and H at both ends of the cap are measured by the length measuring means 28 of the proximal measuring section and the length measuring means 29 of the distal measuring section. I do.

The length measuring means 28 of the base end side measuring section is located at a position G ₁ away from the position G _{1 at the} distance g _{0 in the} wire end direction from the base end α of the cap and at a predetermined distance g _{1 in the} same direction. between up to _2, and calculates the length L of the direction of the shadow is perpendicular to the electric wire and calculate the average length G.

The length measuring means 29 of the distal end side measuring section measures the distance h _{0 in the} direction of the wire clamp position from the cap distal end β.
From the position H ₁ separated by, further until position H ₂ a predetermined distance h ₁ in the same direction, to calculate the length L of the direction of the shadow is perpendicular to the electric wire and calculate the average length H.

The distances g ₀ and h ₀ are values set by the setting unit 24 in accordance with the shape of the cap so as not to measure the end of the cap whose outer diameter changes rapidly. Further, g ₁ and h ₁ are constants determined so that substantially constant outer diameters of various caps can be measured.

Further, the means 30 for detecting a cap orientation defect.
Compares the average length ratio G / H with a reference value, and when the reference value is not satisfied, generates an output of a poor cap orientation.

This reference value determines the orientation of the cap by utilizing the difference in the outer diameter between the distal end and the proximal end of the cap, and is determined to be normal when it exceeds 1.0, for example.

When the inspection of the cap mounting failure is completed, the peeling inspection shown in FIG. 8 is performed.

First, the stripping boundary detecting means 31 detects the stripping boundary A 'of the electric wire coating.

This is because, from the position (measurement start line β ′) that has advanced from the cap tip β by a predetermined line (for example, 4 lines) in order to prevent malfunction due to noise,
The length L of the shadow in the direction perpendicular to the electric wire 1 is measured while changing the measurement position line by line toward the C line.

At this time, a position where the rate of change of the measured value L exceeds a predetermined value and becomes the maximum is detected as a coating stripping boundary A '. Even when measuring up to the C line, this boundary A '
If no is found, it means that the coating remains as shown in FIG. 13 (a), so that a stripping failure signal is output and the inspection is terminated.

When the peeling boundary A 'is found, the peeling failure detecting means 32 detects a peeling failure or an excessive peeling failure.

This means that an A line is defined as a position separated from the strip boundary A 'by a very small distance in the direction of the end of the electric wire.
Set the position apart by a minute distance in the clamped position direction B line, when there is not within the set range ratio L _A / L _B of the length L _B of the shadow of B line of the shadow of A-line with respect to the length L _A 13 (b).

In this setting range, the upper limit value and the lower limit value are set according to the ratio of the core wire diameter to the outer diameter of the covered electric wire to be inspected. Further, the minute distance is determined to be a length that allows the core line portion and the covering portion to be reliably distinguished from each other on the binary image with respect to the stripping boundary A '.

Further, the spreading failure detecting means 33 detects a spreading failure as shown in FIG.

This is because the length L of the shadow in the direction perpendicular to the electric wire is measured while changing the measurement position in the direction of the end of the electric wire between the cap tip β and the C line. The holes through which existing light passes are counted by the number of dots of the binarized data by the perforated dot number counter 34.

The spread error detecting means 33 outputs a core spread error signal when the counted number is equal to or more than a predetermined number when measuring one line.

Further, it is determined by the beard occurrence defect detecting means 35 whether or not the beard has protruded from the tip of the core wire as shown in FIG. This is to output a whisker generation failure signal when a shadowed portion of the D line has a predetermined number or more of dots in the binarized data.

Further, the core wire end defect detecting means 36 checks whether or not there is a change in the diameter of the core wire. It measures the length L _B of the shadow of the length L _C and B lines of the shadow of C line,
When the ratio L _C / L _B is not within the predetermined range, the output is output as a poor spreading of the core wire or a partial cutting fault of the core wire. That is,
In the case of the core wire spreading failure shown in FIG. 12 (e), it becomes larger than the upper limit of the allowable range, and in the case of the core wire peeling off too much in FIG. 12 (c), it becomes smaller than the lower limit of the allowable range.

In the above-mentioned inspection, when a defective mounting of the cap or a defective peeling of the cover is detected, the defective electric wire can be immediately discharged from the processing line without performing the inspection until the end.

In the above description, the detection of the improper installation of the cap and the detection of the improper peeling of the cover are performed at the same time. However, the present invention can be used or manufactured as an apparatus for performing only one of the detections. .

[0072]

According to the inspection apparatus of the present invention for a covered electric wire with a cap, high-speed photographing is carried out by a two-dimensional CCD sensor to capture a vibrating covered electric wire with a cap as a binary still image. Can be performed at the same time, a highly reliable inspection can be performed at high speed, and the end of the covered electric wire with a cap can be efficiently processed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention.

FIG. 2 is a perspective view showing the appearance of one embodiment of the present invention.

3 shows a structural example of a sensor unit having the configuration of FIG.
(a) and (b) are a side view of one embodiment and a front view of a detection surface, and (c) is a side view of another embodiment.

FIG. 4 is a diagram showing a first example of a still image subjected to binarization processing according to the present invention;

FIG. 5 is a diagram showing a second example of a still image subjected to binarization processing according to the present invention;

FIG. 6 is a diagram showing a third example of a still image binarized according to the present invention;

FIG. 7 is a flowchart showing inspection contents of a cap mounting failure according to the present invention;

FIG. 8 is a flowchart showing inspection contents of a coating stripping failure according to the present invention;

FIG. 9 is a view sequentially showing a process in which the covered electric wire with the cap is peeled and the terminal fitting is caulked.

FIG. 10 is a plan view showing a processing procedure of a peeling machine that performs the processing of FIG. 9;

FIG. 11 is a side view of the apparatus of FIG.

FIG. 12 is a diagram showing a specific example of a cap attachment failure.

FIG. 13 is a diagram showing a specific example of a peeling defect.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated electric wire 1a Insulating coating 2 Cap 3 Clamper 4 Core wire 5 Terminal fitting 10 Insulation inspection device of covered electric wire 11 Sensor part 12 Synchronous detection sensor 13 Electronic shutter 14 Two-dimensional CCD sensor 15 Binarization circuit 17 Detection concave part 18, 18 ′ Irradiation unit (backlight illumination) 19 Still image memory 20 Judgment unit 21 Monitor TV 22 Control unit 23 Operation panel 24 Setting unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Hayashi 2-1-1-12 Sonezaki, Kita-ku, Osaka City, Osaka Inside Hokuyo Electric Co., Ltd.

Claims (5)

[Claims] 1. A fixed position is gripped by a clamper with an end to which a cap is attached being in a free state, and the clamper inspects a cap-attached state of a covered electric wire with a cap which is moving at a high speed along a predetermined path by the clamper. A synchronous detection sensor for detecting that the covered electric wire has reached an inspection position; a two-dimensional CCD sensor for opening an electronic shutter and capturing an image of an end of the electric wire at the time of the detection; A binarization circuit for binarizing the output of the two-dimensional CCD sensor to distinguish between the cap and the end of the electric wire serving as a shadow and the other end, a still image memory for storing the binarized image, and a covered electric wire to be inspected And the cap, the wire outer diameter E, the distance g from the cap base α to the base-side measuring part of the cap
₀ , a distance h ₀ from the tip β of the cap to the measurement part on the tip side of the cap, a setting part for setting a displacement limit line F of the tip β of the cap in the direction of the covered electric wire in the binary image, and the binarization. In the image, the shadow length L in the direction orthogonal to the electric wire is measured from the clamper side of the electric wire toward the end of the electric wire, and the length L is smaller than the outer diameter of the electric wire E + Δ (a fixed value that absorbs an error). A cap end detecting means for detecting a position changing to a value exceeding this value as a cap base end α, and detecting a position changing L from a value larger than the wire outer diameter E + Δ to a smaller value as a cap tip β; Is performed up to the displacement limit line F, when neither the cap base end α nor the cap end β is detected,
A detector cap poor mounting to output as none or cap misregistration cap, from the position G ₁ apart the wire end direction from the cap base α by the distance g _0, a predetermined distance g ₁ further in the same direction between the up position G _2, and calculates the length L of the direction of the shadow is perpendicular to the wire, and the length measuring means proximal measuring unit for determining the average length G, the clamping position of the wire from the cap tip β from the position H ₁ separated by the distance h ₀ in the direction, further until position H ₂ a predetermined distance h ₁ in the same direction, to calculate the length L of the direction of the shadow is perpendicular to the wire, the average A length measuring means of the tip side measuring unit for calculating the length H, comparing the ratio G / H of the average length with a reference value, and outputting a cap orientation defect when the reference value is not satisfied. And a detecting means. Inspection apparatus flop with the covered electric wire. 2. In the binarized image, a setting section for setting a C line orthogonal to the electric wire near the end of the electric wire, and changing a measurement position along a direction in which the electric wire extends between the cap tip β and the C line. The length L of the shadow in the direction perpendicular to the electric wire is measured while detecting the position where the rate of change of the length exceeds a predetermined value and becomes the maximum as the stripping boundary A ′ of the coating. And a stripping boundary detecting means for outputting a strip failure signal when no 'is found. A position separated from the stripping boundary A' by a minute distance in the direction of the wire end is separated by a minute distance in the direction of the line B and the clamp position. position was set as a-line, the ratio of the length L _a of the shadow of a-line shadow line B to the length L _B L _B /
When L _A is not within the set range, peeled only claim 1 inspection apparatus capped covered wire according to characterized by including a peeling failure judging means for outputting a failure. 3. The length L of the shadow in the direction perpendicular to the electric wire is measured while changing the measurement position along the extending direction of the electric wire between the tip β of the cap and the C line, and the shadow of each measurement line is measured. A spread defect detecting means for counting the number of dots of the binarized data in the holes through which light passing therethrough is output and outputting a spread defect signal of the core wire when the counted number exceeds a predetermined number when measuring one line. The inspection apparatus for a covered electric wire with a cap according to claim 2, comprising: 4. A setting section for setting a D line which is separated from the electric wire near the end of the electric wire and which is orthogonal to a direction in which the electric wire extends, in the binarized image, 3. The inspection apparatus for a covered electric wire with a cap according to claim 2, further comprising: a whisker failure detecting means for outputting a whisker failure signal when the number of dots of the binary data is equal to or more than a predetermined number. 5. When the ratio of C in the shadow line of the shadow length L _C and B line length L _B is not in the predetermined range, the core ends for outputting as part defective cutting of the spread bad or core of the core wire 3. The inspection apparatus for a covered electric wire with a cap according to claim 2, further comprising a defect detection unit.