JP2006216460A - Method for forming detection part of splicing part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the detection, on the basis of a clear standard from an appearance, of whether or not an insulation sheet is attached in an allowable tolerance in the width direction of a wire splicing part. <P>SOLUTION: Marking jigs are provided on right and left ends of a wire connecting device which welds core wires of wires to be splice-connected or caulking-presses them with a middle pressure connection terminal. Markings are made on the periphery surfaces of the wire by coating a colored paint or winding a colored tape. The insulation sheet is wound on an area involving the splicing position interposed between the right and left marking positions. Whether or not the insulation sheet is being wound on the splicing part in an allowable tolerance can be detected on the basis of the view of the markings in appearance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for forming an inspection part of a splice part of an electric wire, and in particular, enables inspection from the appearance whether an insulating sheet wound around the splice part is attached within an allowable range in the width direction of the splice part. is there.

  As shown in FIG. 9A, the conventional splice part of the electric wire is formed by bundling a plurality of core wires 1a exposed by peeling off the insulation coating of the electric wire 1 and crimping them with an intermediate crimping terminal 2 to branch the circuit. Often connected. In this splice part, since the core wire 1a is exposed, as shown in FIG. 9B, the insulation sheet 3 is wound to perform insulation treatment. As the insulating sheet 3 wound around the splice portion, a dark opaque opaque vinyl chloride sheet such as black is usually used. However, when such an opaque insulating sheet is wound around the splice part, the splice part cannot be seen, and it is impossible to visually check whether the center positions of the insulating sheet and the splice part coincide with each other.

  For this reason, even if the operator wraps the center position of the insulation sheet by mistake from the center of the splice, the worker and the inspector cannot inspect from the outside after the wrapping. There is a risk. Thus, when the insulating sheet is wound out of the center of the splice part, the splice part is easily exposed, and there is a problem that reliable insulation cannot be achieved.

  In order to solve such a problem, in Patent Document 1 (Japanese Patent Laid-Open No. 8-306406), as shown in FIG. 10, the insulating sheet 3 is made a translucent sheet and wound around a splice portion. According to this technique, since the insulating sheet 3 is translucent, the splice portion can be visually observed after the insulating sheet is wound, so that it can be found that the insulating sheet is wound in a shifted manner.

  However, in the above method, it is unclear how much the insulating sheet is displaced from the center of the splice part and whether the deviation is within an allowable range, and the inspection standard cannot be clarified. For this reason, each worker or inspector must rely on his / her intuition to pass or fail the displacement of the insulating sheet, and the problem remains that the quality is not stable.

  In recent years, there is an increasing number of part-timer work, outsourcing, or transfer of manufacturing to foreign factories, and inspections with clear inspection standards that do not change even if manufacturing factories, workers, or inspectors change. There is a need for a method.

JP-A-8-306406

  The present invention has been made in view of the above problems, and in the state in which the insulating sheet is wound around the splice part of the electric wire, it is visually confirmed from the appearance whether the insulating sheet is correctly wound within the allowable tolerance width in the width direction of the splice part. It is an object to provide a method for forming an inspection part of a splice part that can be clearly given pass / fail inspection standards.

In order to solve the above-mentioned problems, first, the present invention provides an outer peripheral surface of an electric wire to be spliced to the left and right ends of an electric wire joining apparatus that welds or crimps the core wires of the electric wires to be spliced with intermediate crimp terminals. Marking jigs for marking by applying colored paint or wrapping colored tape around are projected with the same dimensions on the left and right.
During the step of splicing with the electric wire joining device, marking is performed with a marking jig on the electric wires at equally spaced positions from the splice position,
Then, an insulating sheet is wound around the region including the splice position sandwiched between the left and right marking positions, and the left and right markings are allowed to appear on the outside of the insulating sheet,
There is provided a method for forming an inspection portion of a splice portion that can be inspected by allowing the left and right markings to be seen as to whether the insulating sheet is wound around the splice portion.

By adopting the above-described method, when the insulating sheet and the colored tape for marking are mounted with a gap, it can be confirmed that the insulating sheet is mounted to the splice within the allowable tolerance in the width direction. In this way, when the insulating sheet and the colored tape are mounted with a gap on both the left and right sides, it can be determined that the inspection has passed.
On the other hand, when the insulating sheet is mounted so as to cover the colored tape for marking, it is understood that the mounting tolerance is exceeded. As described above, when the insulating sheet is mounted so as to cover the colored tape, it can be determined that the inspection has failed.

The crimping and marking of the intermediate crimping terminal are performed at the same time in the same device, and the positional relationship between the splice part and the marking is performed in a certain state as set by the marking jig, so it may vary depending on the operator. Absent.
However, the mounting of the insulating sheet is a separate process from the crimping of the intermediate crimp terminal, and is usually performed semi-automatically or manually, with manual intervention, so the mounting position in the width direction of the splice part and the insulating sheet is shifted. There is a fear. According to the present invention, it is possible to visually inspect whether or not the insulating sheet is mounted in an allowable range in the width direction on the basis of the accurately marked colored tape, and to determine whether the insulating sheet is acceptable or not based on a clear standard. can do.

Secondly, the present invention is such that a colored tape is wound around the outer peripheral surface of a splice-connected electric wire on one side in the left-right direction of a wire joining device that welds or crimps the core wires of the splice-connected electric wires with intermediate crimp terminals. The marking jig for marking is projected with the required dimensions,
The width of the colored tape for marking is twice as wide as the allowable tolerance width, half of the width is different by color, or a line is provided at the center of the width,
At the time of the step of splicing with the wire joining device, the marking jig is wound around the colored tape at a position away from the splice joining position to the required dimension on one side,
Then, an insulating sheet is wrapped around the region including the splice position from the edge of the colored tape, and the colored tape is allowed to appear outside the insulating sheet.
Whether or not the insulating sheet is wound around the splice part is determined that the splice part is wound around the insulating sheet if the entire colored tape or the colored part or the line outside the colored tape is visible. The present invention provides a method for forming an inspection part of a splice part.

  If the entire colored tape or the colored portion on the outside of the colored tape or the line is visible by the above method, the splice portion is visually inspected to be acceptable with an insulating sheet and passed. It can be judged. And pass / fail can be judged on clear criteria.

Thirdly, the present invention is to perform marking by winding a colored tape around the outer peripheral surface of a splice-connected electric wire at the left and right ends of a wire joining device that welds or crimps the core wires of the spliced electric wires with intermediate crimp terminals. The marking jig is projected with the same left and right dimensions,
During the step of splicing with the wire joining device, the colored tape for marking is wrapped around and fastened with the marking jig around the wire at equal intervals from the splice position;
Next, a foamed sheet filled with a sealing agent is wound around an area including the splice position sandwiched between fastening positions of the left and right colored tapes for marking, and the left and right colored tapes for marking are placed outside the foamed sheet. The appearance is allowed,
Then, an insulating transparent tape is wrapped around and fixed to the area covering the left and right colored tapes for marking,
There is provided a method for forming an inspection portion of a splice portion that allows inspection of the left and right colored tapes for marking whether the foam sheet is wound around the splice portion through the transparent tape.

  According to this method, the transparent tape can be permeated, the colored tape and the foamed sheet can be visually observed, and pass / fail can be determined by the same method as described above. As described above, even if the splice requires waterproofness, it is possible to clearly determine pass / fail by visual observation.

  As described above, according to the present invention, whether or not the insulating sheet is accurately wound around the allowable tolerance range in the width direction can be determined only by visual inspection, and the determination criteria for pass / fail is clear. In addition, it is possible to perform inspections based on unified standards rather than judgment based on the intuition of workers and inspectors. As a result, if there is a problem, it can be quickly corrected. In addition, the insulating sheet is not limited to a transparent / semi-transparent sheet, and any material / color material can be used. Therefore, the insulating sheet can be used for identification by color coding or for existing inexpensive materials. There is also an effect that the degree of freedom to adopt is improved.

A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a crimping and marking device and a method thereof, which are wire splicing devices for splices. FIG. 1A shows a state before crimping and marking the intermediate crimp terminal to the splice part, and FIG. 1B shows a state after crimping and marking the intermediate crimp terminal to the splice part.

In FIG. 1, 1 and 1 ′ are covered electric wires to be spliced, 1 a and 1 a ′ are conductive wires stripped of an insulating coating, and 2 is a conductive metal such as copper for bundling and joining a plurality of conductive wires 1 a. It is a U-shaped intermediate crimp terminal made of a material.
Reference numeral 4 denotes an electric wire joining device, 4a denotes an upper crimping die, and 4b denotes a lower crimping die, which are separated from and approach each other.

  In a state where the upper crimping die 4a and the lower crimping die 4b are separated from each other, the intermediate crimping terminal 2 through the lead wire 1a is inserted between the upper crimping die 4a and the lower crimping die 4b. By crimping the intermediate crimping terminal 2 with 4b approaching, the plurality of conductors 1a are firmly crimped and crimped, and the covered wires 1 and 1 'are spliced.

A pair of left and right marking jigs 5A and 5B are attached via connecting rods 6 and 6 having the same dimensions from the left and right sides of the main body 4c with the crimping upper die 4a of the wire joining device 4 attached to the lower surface. The marking jigs 5 </ b> A and 5 </ b> B are capable of supplying a colored tape 7 used as an allowable tolerance display unit and winding the colored tape 7 around the outer periphery of the covered electric wire 1. For the colored tape 7, a vinyl chloride tape coated with an adhesive is used.
The dimensions between the main body 4c and the marking jigs 5A and 5B are such that when the insulating sheet is wound between the left and right marking jigs 5A and 5B, the insulating sheet is allowed to cross between the intermediate crimping terminals 2. It is set to a position inside.
In addition, the connection part 6 is extendable, and the distance between the marking jig 5 and the main body 4c of the wire joining device may be adjustable according to the shape of the splice part.

  FIG. 2 is a diagram illustrating a method of mounting the resin insulating sheet 3 on the splice portion. FIG. 2A is a diagram showing a state before the insulating sheet 3 is mounted, and an adhesive is applied to the inner surface of the insulating sheet 3. In the figure, Lw is the width of the splice part, Ls is the width of the insulating sheet, and Lm is the inner width of the left and right colored tapes 7. The width Ls of the insulating sheet 3 is made larger than the width Lw of the splice with a margin, and is made smaller than the inner width Lm of the colored tape 7 by the allowable tolerance width for mounting the insulating sheet 3. In other words, the inner width Lm of the colored tape for marking is larger than the width Ls of the insulating sheet by the allowable mounting tolerance in the width direction of the insulating sheet 3. G1 and G2 are distances between the end portions of the marking colored tape 7 and the left and right end portions of the insulating sheet 3.

  FIG. 2B shows a state in which the insulating sheet 3 is wound around the splice portion. Since the insulating sheet 3 and the coloring tape 7 are mounted with an interval of G1 and G2, it can be confirmed that the insulating sheet 3 is mounted within the allowable tolerance in the width direction on the splice portion. Thus, when the insulating sheet 3 and the colored tape 7 are mounted with a gap on both the left and right sides, the inspection is passed.

FIG. 2C shows that the insulating sheet 3 is mounted so as to cover a part of the colored tape 7 and thus exceeds the mounting tolerance. In this way, when the insulating sheet 3 is mounted so as to cover even part of the colored tape 7, it is rejected by the inspection.
FIG. 2D shows that the insulating sheet 3 is mounted so as to cover the entire colored tape 7 and thus exceeds the mounting tolerance. As described above, even when the insulating sheet 3 is mounted so as to cover the entire colored tape 7, the inspection is rejected.

As described above, the crimping and marking of the intermediate crimping terminal 2 are performed simultaneously in the same apparatus, and the positional relationship between the splice part and the marking is constant as initially set the marking jig 5 by adjusting the connecting part 6. Since the work is performed in the state of, there is no variation by the worker.
On the other hand, the mounting of the insulating sheet 3 is a separate process from the crimping of the intermediate crimping terminal, and is usually performed semi-automatically or manually, with manual intervention. May shift.
However, according to the above embodiment, it is possible to visually inspect whether or not the insulating sheet 3 is mounted within the allowable range in the width direction on the basis of the accurately marked colored tape 7, and pass the clear standard.・ You can judge failure.

  Furthermore, as shown in FIG. 3, the coated wire 1 to be spliced may be subjected to a force in the direction in which the plurality of coated wires 1 are torn as indicated by arrows in the drawing. Even in this meeting, since the colored tape 7 is wound, no tearing force is directly applied to the splice part, so that the splice part and the insulating sheet 3 can be protected.

  FIG. 4 is a diagram showing a second embodiment. Unlike 1st Embodiment, the marking jig 5 and the connection part 6 are provided only in the one side of the electric wire joining apparatus main body 4c. The width of the colored tape 7 for marking is twice the allowable tolerance width for mounting the insulating sheet 3. The left and right sides of the colored tape 7 are divided into two parts 7a and 7b, or the boundary between 7a and 7b is different. Is provided with a line 7c. The inner half 7b of the coloring tape 7 is used as an allowable tolerance display portion, the outer end of 7b is set as an outer limit line 7d, and the inner end is set as an inner limit line 7e. The crimping method of the intermediate crimp terminal 2 and the method of applying the colored tape 7 are the same as those in the first embodiment.

FIG. 5 is a diagram for explaining a mounting method and an inspection method of the insulating sheet 3. FIG. 5A is a diagram showing a state before the insulating sheet 3 is mounted. In the above-described process, the central portion of the inner side 7b of the colored tape 7 is 1 of the width Ls of the insulating sheet 3 from the center portion of the splice. The position is separated by / 2.
FIG. 5 (B) is a view showing a state in which the insulating sheet 3 is wound around the splice portion, and is mounted with the end portion 3a of the insulating sheet 3 coming on the inner side 7b of the coloring tape 7, and the inner limit line. Since only 7e is covered with the insulating sheet, it can be confirmed that the insulating sheet 3 is mounted within the allowable tolerance in the width direction, and it is determined to be acceptable.

  FIG. 5C is a view showing a state in which the insulating sheet 3 is similarly wound around the splice portion, but the insulating sheet 3 covers all the inner side 7b of the colored tape 7, and both the outer limit line 7d and the inner limit line 7e. Is covered with the insulating sheet 3, it can be confirmed that the insulating sheet 3 is mounted with an allowable tolerance width protruding, and it is determined that the sheet is rejected. Of course, even when the insulating sheet 3 covers and hides all of the colored tape 7, it can be confirmed that the allowable tolerance width is protruded, and it is determined as a failure.

FIG. 5 (D) is also a view showing a state in which the insulating sheet 3 is wound around the splice portion, but is attached so that the end portion 3a of the insulating sheet 3 is located further inside than the inner side 7b of the coloring tape 7. In addition, since both the outer limit line 7d and the inner limit line 7e are not covered with the insulating sheet, it can be confirmed that the insulating sheet 3 protrudes the allowable tolerance width, and is judged to be unacceptable.
As described above, in the second embodiment, since marking with the colored tape 7 is only required on one side, there is an advantage that the apparatus can be simplified and the colored tape can be saved.

FIG. 6 shows the third embodiment, and only points different from the second embodiment will be described.
FIG. 6A is a diagram showing a state before the insulating sheet 3 is mounted, and the width of the colored tape 7 is the same as the allowable tolerance width. The outer end of the colored tape 7 is an outer limit line 7d, and the inner end is an inner limit line 7e. The central portion of the coloring tape 7 is located at a position separated from the central portion of the splice by ½ of the width Ls of the insulating sheet 3.
FIG. 6 (B) is a diagram showing a state in which the insulating sheet 3 is wound around the splice portion, where the end portion 3a of the insulating sheet 3 is mounted on the coloring tape 7 and only the inner limit line 7e is attached. Since it is covered with the insulating sheet, it can be confirmed that the insulating sheet 3 is mounted within the tolerance in the width direction, and it is determined to be acceptable.

  FIG. 6C is a view showing the state in which the insulating sheet 3 is similarly wound around the splice, but the insulating sheet 3 covers all of the colored tape 7, and both the outer limit line 7d and the inner limit line 7e are shown. Since it is covered with the co-insulating sheet 3, it can be confirmed that the insulating sheet 3 is mounted with an allowable tolerance width protruding, and it is determined that the sheet is rejected.

  FIG. 6 (D) is also a diagram showing a state where the insulating sheet 3 is wound around the splice portion, and is mounted so that the end portion 3a of the insulating sheet 3 comes inside the coloring tape 7, and the outer limit is reached. Since both the line 7d and the inner limit line 7e are not covered with the insulating sheet, it can be confirmed that the insulating sheet 3 protrudes the allowable tolerance width, and is judged to be unacceptable.

  Compared with the second embodiment, the third embodiment does not require a special colored tape as the colored tape 7 and has an advantage that an inexpensive existing tape can be used.

FIG. 7 shows the fourth embodiment, and only differences from the third embodiment will be described.
FIG. 7A is a diagram showing a state before the insulating sheet 3 is mounted. As an allowable tolerance display portion, instead of the colored tape 7, the outer limit line 7d and the inner limit line 7e are spaced at the same interval as the allowable tolerance width. Is applied by paint or ink application. The center part of the outer limit line 7d and the inner limit line 7e is a position separated from the center part of the splice by ½ of the width Ls of the insulating sheet 3.
FIG. 7B is a diagram showing a state in which the insulating sheet 3 is wound around the splice portion, and the end portion 3a of the insulating sheet 3 is mounted so as to exist between the outer limit line 7d and the inner limit line 7e. Since only the inner limit line 7e is covered with the insulating sheet 3, it can be confirmed that the insulating sheet 3 is within the allowable tolerance in the width direction, and it is determined to be acceptable.

FIG. 7C is a view showing the state in which the insulating sheet 3 is similarly wound around the splice portion, but since the insulating sheet 3 covers both the outer limit line 7d and the inner limit line 7e, the insulating sheet 3 is It can be confirmed that the allowable tolerance width is protruded, and it is judged as rejected.
FIG. 7D is a view showing the state in which the insulating sheet 3 is wound around the splice portion, but the end portion 3a of the insulating sheet 3 is mounted so as to be inside the inner limit line 7e, Since both the limit line 7d and the inner limit line 7e are not covered with the insulating sheet 7, it can be confirmed that the insulating sheet 3 protrudes the allowable tolerance width, and it is determined to be rejected.

Compared with the third embodiment, the fourth embodiment has an advantage that the colored tape 7 can be dispensed with only by applying paint or ink.
In this case, it is possible to provide the permissible crossing display portion by an extremely simple means without requiring a colored tape, paint or ink.

FIG. 8 shows a fifth embodiment in the case of a splice requiring waterproofness, and only differences from the previous embodiment will be described.
FIG. 8A is a diagram showing a state before the insulating sheet 3 is mounted. The insulating sheet 3 uses an opaque foam sheet, and a filler such as silicon (water-stopping agent) on the foamed sheet. 8 is applied. Reference numeral 9 denotes a transparent tape having an upper surface coated with an adhesive and is wound around the outer periphery of the insulating sheet 3. Similar to the above-described embodiment, the covered wire 1 is provided with a colored tape 7 as an allowable tolerance display portion.

FIG. 8B is a diagram showing a state in which the insulating sheet 3 and the transparent tape 9 are wound around the splice portion. Since the transparent tape 9 is transparent, the colored tape 7 and the insulating sheet 3 can be visually observed, It is possible to judge pass / fail by the same method.
As in this embodiment, even if the splice requires waterproofness, and the splice portion must be covered with an opaque insulating sheet, the pass / fail status is clarified by visual observation as in the above embodiment. Can be judged.

As described in the above embodiment, whether or not the insulating sheet 3 is accurately wound in the allowable range in the width direction can be determined only by visual inspection, and the determination criteria for pass / fail is clear, It is possible to perform inspections based on unified standards rather than judgment based on the intuition of workers and inspectors. As a result, if there is a defect, it can be quickly corrected and defective products can be prevented from flowing into the market.
In addition, the insulating sheet is not limited to a transparent / semi-transparent sheet, and any material and color material can be used. Therefore, the insulating sheet can be used for identification by color, or for existing inexpensive materials. There is also an advantage that the degree of freedom to adopt is improved.
Note that the tolerance in the width direction is determined by examination and design considerations, and marking is applied according to this tolerance. However, when setting or changing the tolerance, the marking 6 is adjusted. By doing so, there is an advantage that it can be set and changed freely.

  In addition, although the splice part of the said embodiment has couple | bonded by the method of crimping | bonding an intermediate | middle crimp terminal, you may use resistance welding or ultrasonic welding, and apply | coat paint or an ink instead of a coloring tape, or a coated electric wire. A stamp that has been pressed to the extent that it is not damaged may be substituted, and can be applied with appropriate changes.

  The above-described embodiment relates to a method for forming an inspection portion of a splice portion of an electric wire, and in particular, whether or not an insulating sheet wound around the splice portion is attached within an allowable range of the splice portion is visually observed and based on a clear inspection standard. It is an inspection method, and can be suitably used for a wire harness used in an automobile.

The crimping | compression-bonding and marking method of the intermediate crimp terminal of 1st Embodiment are shown, (A) is before crimping and marking, (B) is a front view which shows the state after crimping and marking. The method for winding and inspecting the insulating sheet of the first embodiment is shown, (A) is a plan view before winding the insulating sheet, (B) (C) (D) is a plan view showing a method for winding and inspecting the insulating sheet. . It is an external view which shows the secondary effect of 1st Embodiment. It is a front view which shows the method of crimping | crimping and marking of the intermediate crimp terminal of 2nd Embodiment. The method of winding and inspecting the insulating sheet of 2nd Embodiment is shown, (A) is before winding of an insulating sheet, (B) (C) (D) is a top view which shows the method of winding and inspecting an insulating sheet. . The method of winding and inspecting the insulating sheet of 3rd Embodiment is shown, (A) is before winding of an insulating sheet, (B) (C) (D) is a top view which shows the method of winding and inspecting an insulating sheet. . The method of winding and inspecting the insulating sheet of the fourth embodiment is shown, (A) is a plan view before winding the insulating sheet, (B) (C) (D) is a plan view showing a method of winding and inspecting the insulating sheet. . The method of winding and inspecting the insulating sheet of 5th Embodiment is shown, (A) is before winding of an insulating sheet, (B) is a top view which shows the state which wound the insulating sheet. It is an external view which shows a prior art. It is an external view which shows another prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Covered electric wire 2 Intermediate crimp terminal 3 Insulation sheet 4 Electric wire joining apparatus 5 Marking jig 6 Connecting part 7 Coloring tape
7d outer limit line 7e inner limit line

Claims (3)

A marking jig that performs marking by wrapping colored coating or colored tape around the outer peripheral surface of the spliced wire at the left and right ends of a wire joining device that welds or crimps the core wires of the spliced wires with intermediate crimp terminals. , Protruding left and right the same dimension,
During the step of splicing with the wire joining device, marking is performed with a marking jig on the electric wires at equidistant positions on the left and right sides from the splice position,
Then, an insulating sheet is wound around the region including the splice position sandwiched between the left and right marking positions, and the left and right markings are allowed to appear on the outside of the insulating sheet,
A method for forming an inspection portion of a splice portion, wherein the left and right markings can be inspected as to whether the insulating sheet is wound around the splice portion. Marking jig for marking by winding colored tape around the outer peripheral surface of the spliced wire on one side in the left and right direction of the wire joining device that welds or crimps the core wires of the spliced wires with intermediate crimp terminals It protrudes with
The width of the colored tape for marking is twice as wide as the allowable tolerance width, half of the width is different by color, or a line is provided at the center of the width,
At the time of the step of splicing with the wire joining device, the marking jig is wound around the colored tape at a position away from the splice joining position to the required dimension on one side,
Then, an insulating sheet is wrapped around the region including the splice position from the edge of the colored tape, and the colored tape is allowed to appear outside the insulating sheet.
Whether the insulating sheet is wound around the splice portion or not, if the entire colored tape or the colored portion outside the colored tape or the line is visible, the splice portion is considered to be wound around the insulating sheet. An inspection part forming method for splice parts. Marking jigs that mark the outer peripheral surface of the spliced wire by marking the outer periphery of the wire splicer connected to the left and right ends of the wire joining device that welds or crimps the core wires of the spliced wires with intermediate crimp terminals. It is open and protruding,
During the step of splicing with the wire joining device, the colored tape for marking is wrapped around and fastened with the marking jig around the wire at equal intervals from the splice position;
Next, a foamed sheet filled with a sealing agent is wound around an area including the splice position sandwiched between fastening positions of the left and right colored tapes for marking, and the left and right colored tapes for marking are placed outside the foamed sheet. The appearance is allowed,
Then, an insulating transparent tape is wrapped around and fixed to the area covering the left and right colored tapes for marking,
A method of forming a splice portion inspection portion, wherein the left and right colored tapes for marking can be inspected to determine whether the foam sheet is wound around the splice portion through the transparent tape.

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