JP2003257263A - Wire cutting length tuning method, and measuring device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suely measure an excessive length of a loosened wire of a wire harness. <P>SOLUTION: A triangle having center of jigs P1, P2, and lower end of a pulled wire P3 as apexes, is formed by pulling the wire W flexibly held between both jigs G1, G2 in the direction perpendicular to the laying direction, and excessive length of the wire to be cut is calculated by the formula on condition that L represents the length of the base P1-P2; A, B represent the length of oblique sides P1-P3, P2--P3; H represents the height from the base to P3; L1 represents the length between the foot of the perpendicular dropped from P3, and P1; L2 represents the length between the foot of the perpendicular dropped from P3, and P2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire cutting length tuning method and a measuring instrument used in the method, and more specifically, when tuning a wire harness before manufacturing, the wires forming the wire harness have an appropriate length. It is inspected whether or not there is any slack, and the surplus amount of the loosened wire is accurately measured.

[0002]

2. Description of the Related Art Conventionally, in the process of manufacturing a wire harness for an automobile, each wire constituting the wire harness is cut according to a design value, and then the wires are actually bundled to assemble the wire harness to obtain an appropriate length. I'm tuning what is going on. For the tuning, as shown in FIG. 7, after the wire harness W / H is bridged between the jigs G erected on the assembly workbench B, an inspection such as whether or not each wire W has an extra length is performed. ing.

Specifically, as shown in FIG. 8 (A), an operator visually checks an electric wire W laid between the jigs G and confirms that the electric wire stretched straight has an appropriate length. It is judged that there is slack Wa, and the wire W recognized by the worker as having slack Wa is considered to have extra length.

The first method of measuring the excess length X of the electric wire W is, as shown in FIG. 8 (B), the slack Wa portion of the electric wire W is pulled up by hand, and the folded back portion Wb is measured with a ruler. The extra length X is obtained by doubling / 2X. Alternatively, as a second measuring method of the surplus length X, as shown in FIG.
, The connector J at the wire end is removed, and one end of the loose wire W is pulled in the wiring direction to loosen the jig G between the jigs G.
By eliminating a, the length of the pulled-out portion Wc of the electric wire W is measured with a ruler to obtain the extra length X.

[0005]

However, in the first measuring method described above, since the worker pulls the slack Wa of the electric wire W by hand, if the slack remains other than the folded-back portion Wb to be measured by the ruler. The surplus amount cannot be measured accurately, the surplus amount varies subjectively among workers, and the worker needs experience to make an accurate judgment. Similarly in the second measuring method, the measurement of the excess length varies among workers, and the connector J must be removed when pulling one end of the electric wire W, which is troublesome.

The present invention has been made in view of the above problems, and it is an object of the present invention to accurately measure the excess length of an electric wire that is loosened among the electric wires that form a wire harness.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is to hold an electric wire by an electric wire receiving jig erected on an assembly workbench during tuning performed before manufacturing a wire harness. It is a wire cutting length tuning method that arranges wires and measures the excess length when slackness occurs in the wire between the wire receiving jigs and cuts the excess length from the wire to prevent slack. Then, the electric wire bent between the jigs on both sides adjacent to each other is pulled in the direction orthogonal to the wiring direction, and the jig centers P1 and P2 on both sides and the tip P3 of the pulled electric wire are used as apexes, and P1 -P2 is defined as a base having a length L, and P1-P3 and P2-P3 are formed as triangles having oblique sides P1-P3 and P2-P3 having lengths A and B, respectively. Height H from bottom to P3
Therefore, the following formula provides a wire cutting length tuning method for calculating the excess length of the wire to be cut. However, L1 is the position of the vertical line P4 and P
The length L2 between 1 and 1 is the length between the positions P4 and P2 of the perpendicular line drawn from P3 to the bottom.

When the above triangle is formed, the length L (= L1 +) of the bottom side P1-P2 which is the distance P1-P2 between the jigs.
L2) is regarded as the proper length of the electric wire, and the sum A + B of the lengths of the hypotenuses is the actual length of the electric wire existing between the jigs, so the extra wire length is (A + B) −L, that is, ( A + B)
It is calculated by − (L1 + L2) and can be calculated by the formula.

Also, the hypotenuse P1-P3 and a part of the bottom P1-
From the relational expression A ² = L1 ² + H ² of each side of the right triangle formed by P4 and the height H, the length A of the hypotenuse P1-P3 can be calculated by the expression. Similarly, from the relational expression B2 = L22 + H2 of each side of the right triangle formed by the hypotenuse P2-P3, a part P2-P4 of the base and the height H, the hypotenuse P2-
The length A of P3 can be calculated by an equation.

Therefore, by substituting the above equation into the equation, the extra wire length can be calculated from the values of L1, L2, and H.

According to the above tuning method, since a triangle is formed between the jig centers P1 and P2 and the tip P3, the slack of the electric wire is left in places other than the measuring point of the extra length as in the conventional case. And the measurement accuracy is improved. Also, when calculating the excess wire length, the hypotenuses P1-P3,
If the length of P2-P3 is to be measured directly, the hypotenuse P1-P3
There is a possibility that the accuracy may decrease due to the position of the operator holding the pulling tip P3 of the electric wire deviating between the time of measuring the length A of the wire and the time of measuring the length B of the hypotenuse P2-P3. According to the above, since the measurement of the pulling tip P3 of the electric wire is performed only once when measuring the length H of P3-P4, the measurement accuracy is improved as compared with measuring the hypotenuses P1-P3 and P2-P3. Therefore, according to the method of the present invention, the measurement result does not vary from worker to worker, and no skilled experience is required.

A first measuring instrument used in the above wire cutting length tuning method, in which a first ruler for measuring a bottom dimension is attached between adjacent jigs and slidable on the first ruler. A second ruler for height measurement protruding in an orthogonal direction is attached, the second ruler is positioned so as to pass through the point P3, and the dimensions L1, L2 and H are obtained from the first ruler and the second ruler. We provide a measuring instrument for tuning the wire cutting length.

If the first measuring instrument for tuning the electric wire cut length is used, the first ruler is simply bridged between the jigs that bridge the electric wires, and the worker does not need to hold the first ruler. Since the dimensions L1 and L2 can be measured, the reading accuracy is improved, and since the second ruler in the orthogonal direction is slidably attached to the first ruler, the second ruler can be slid to easily perform the above operation. It can be located at P3. Further, since the second ruler is attached to the first ruler that is bridged between the jigs, it is not necessary to hold the second ruler when measuring the dimension H.

Further, as an application of the above method, an electric wire slackened between the jigs is pulled in a direction orthogonal to the center of the bottom side between the jigs to form an isosceles triangle having P1, P2 and P3 as vertices. It is preferable to calculate the excess length of the electric wire with the hypotenuses A and B having the same length.

Thus, the triangle formed by P1, P2, and P3 is an isosceles triangle with P3 as the apex, so that P1-P4 = P2-P4 and P1-P3 =
Since P2-P3, the above-mentioned various amounts are L1 = L2 = 1 /
2L and the relationship of A = B is satisfied. Where A = B =
Letting C be, the equation is: extra wire length = (C-1 / 2L) + (C-1 / 2L) = 2C-L- ' And can be simplified.

Therefore, by substituting the expression'into the expression ', the electric wire extra length can be obtained by knowing only two values, L and H'.

A second measuring instrument used in the above wire cutting length tuning method, in which a first ruler for measuring a bottom dimension is attached between adjacent jigs and is orthogonal from a center position of the first ruler. The second ruler for height measurement in the direction, and the electric wire is pulled in the orthogonal direction so that the P3 is located at a position passing through the second ruler. We provide a measuring instrument for tuning the wire cutting length, which is required by the second ruler.

If the second measuring device for tuning the electric wire cut length is used, the second ruler is preliminarily projected at the center position of the first ruler, so that the second ruler is located at the center between the adjacent jigs. If you install the first ruler to do so, just align the tip P3 that pulled the electric wire with the position passing through the second ruler,
The extra length can be easily obtained by the above formulas ','.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. Figure 1
Shows a measuring instrument 10 for tuning the electric wire cutting length, and slides with a strip-shaped first ruler 11 with a scale 11a and a strip-shaped second ruler 12 with a scale 12d protruding downward at a right angle. It is attached freely.

The second ruler 12 has a frame portion 12 in the upper portion.
a is provided so as to project, and the frame portion 12a is fitted onto the first ruler 11 so that it can slide in the direction of the arrow with respect to the first ruler 11. In addition, the second ruler 12 includes the first
Scale 11 of the first ruler 11 at the intersection with the ruler 11
A window 12b through which a can be seen is formed, and an inverted triangular mark 12c for reading the scale 11a is attached to the center of the upper end of the window 12b.

FIG. 2 shows two substantially Y-shaped jigs G1 and G2.
Among the wire harnesses bridged between the two, only one electric wire W having a slack Wa is shown, and the adjacent jigs G1, G
The first ruler 11 of the measuring device 10 is bridged between the two.
Here, the centers of the jigs G1 and G2 are P1 and P2, respectively, the slack electric wire W is pulled downward perpendicular to the wiring direction to P3, and the position of the perpendicular line from P3 to the first ruler 11 is P.
If it is 4, it can be represented by the triangle shown in the schematic view of FIG.

In the above triangle, the length of the base P1-P2 is L, the lengths of the hypotenuses P1-P3, P2-P3 are A, B, respectively.
The length of the left side portion P1-P4 of the bottom side is L1, and the right side portion P of the bottom side is
The length of 2-P4 is L2, and the height of the triangle is H.

When the above triangle is formed, the bottom sides P1-P
Since the length L of 2 (= L1 + L2) is the distance between the jigs G1 and G2, it is regarded as an appropriate length of the electric wire, and each oblique side P1-
The sum A + B of the lengths of P3, P2-P3 is each jig G1, G2.
Since it is the actual length of the electric wire W existing between them, the extra wire length is obtained by A + BL, that is, (Equation 3) Extra wire length = (AL-1) + (BL2) Can be calculated.

Next, the oblique side P1-P3 and the left side portion P1 of the bottom side
From the relational expression A ² = L1 ² + H ² of each side of the right triangle formed by −P4 and the height H, the length A of the hypotenuse P1-P3 can be calculated by the expression 1. (Equation 1) Similarly, the relational expression B ² = L of each side of the right triangle formed by the hypotenuse P2-P3, the right side portion P2-P4 of the base, and the height H.
Than ² 2 + ^H 2, the length A of the hypotenuse P2-P3 can be calculated by Equation 1. (Formula 2)

Therefore, by substituting the equations 1 and 2 into the equation 3, the extra wire length can be calculated. That is, in the first ruler 11, the distance L1 from the center position P1 of the jig G1 to the center of the window portion 12b and the distance L2 from the center position P2 of the jig G2 to the center of the window portion 12b are read on the scale 11a. , The distance H from the lower end of the window 12a to the tip P3 of the electric wire W is read on the scale 12d,
By substituting 2, H into each of the above equations, it is possible to calculate the excess wire length.

According to the above, since the triangles are formed between the centers P1 and P2 of the jigs G1 and G2 and the tip P3 of the electric wire W, the electric wire W is not provided in the conventional position other than the measuring point of the extra length.
There is no slack left and measurement accuracy is improved. Further, according to this method, since the measurement of L1, L2, and H is performed only by reading the scales 11a and 12d, the measurement result does not vary from worker to worker, and no skilled experience is required.

Further, by using the measuring device 10 described above,
Even if the operator does not hold the first ruler 11, the above-mentioned dimensions L1 and L can be obtained simply by bridging the first ruler 11 between the jigs G1 and G2.
Since it is possible to measure H and H, the reading accuracy is improved, and since the second ruler 12 is slidably attached to the first ruler 11, simply sliding the second ruler 12 makes it easy to move to P3 above. Can be located.

4 to 6 show a second embodiment. Figure 4
Is a measuring device 2 for tuning the electric wire cut length of the second embodiment.
The first ruler 21 in the form of a strip that indicates 0 and has a scale 21a.
In addition, the strip-shaped second ruler 12 with the scale 22a is integrally projected downward at a right angle. Note that the scale 21a of the first ruler 21 has a zero point 21a-at the intersection position with the second ruler 22.
1 is attached symmetrically.

As shown in FIG. 5, the measuring device 2 is arranged so that the second ruler 22 is located at the center between the adjacent jigs G1 and G2.
The first ruler 21 of 0 is bridged between the jigs G1 and G2. Here, the centers of the jigs G1 and G2 are respectively P1, P2,
The slackened wire W is pulled downward at right angles to the wiring direction, and the tip located at the center of the second ruler 22 is
3 ′, the zero point 21a− of the first ruler 21 and the second ruler 22
When 1 is P4 ′, it can be represented by an isosceles triangle shown in the schematic view of FIG.

In the above-mentioned isosceles triangle, the length of the base P1-P2 is L, and the lengths of the hypotenuses P1-P3 and P2-P3 are C and P1.
The length of -P4 and P2-P4 is 1 / 2L, and the height of the triangle is H '.

When the above triangle is formed, each jig G1,
The length L of the bottom side P1-P2, which is the distance between G2, is regarded as the proper length of the electric wire, and each oblique side P1-P3 ', P2-P3'.
Since the sum 2C of the lengths of the two is the actual length of the electric wire W existing between the jigs G1 and G2, the extra wire length can be calculated by the following equation 5. (Equation 5) Extra wire length = 2C-L

Next, the oblique side P1-P3 'and a part P1 of the bottom side
From the relational expression C ² = (1 / 2L) ² + H ′ ² of each side of the right triangle formed by −P4 ′ and the height H ′, the hypotenuse P1−
The length C of P3 ′ can be calculated by Equation 4. (Equation 4)

Therefore, the extra wire length can be calculated by substituting equation 4 into equation 5. That is, the first
In the ruler 21, the distance L between the jig G1 and the jig G2
Is read on the scale 21a, the distance H'from the zero point P4 'to the tip P3' of the electric wire W is read on the scale 22a, and the extra length of the wire is calculated by substituting the L and H'into the above equations. be able to.

If the measuring device 20 is used, the second ruler 22
Since it is previously projected at the center position of the first ruler 21,
If the first ruler 21 is installed so that the second ruler 22 is located in the center between the adjacent jigs G1 and G2, the jigs G1 and G2
Only the distance L and the height H of the tip P3 of the electric wire W need to be measured, and the calculation formulas only need to be the above two formulas.

[0035]

As is clear from the above description, according to the present invention, the excess wire length can be calculated by simply substituting L1, L2, and H into the above equations. At that time, since a triangle is formed between the jig centers P1 and P2 and the tip P3, there is no slack in the electric wire other than the measuring point of the extra length unlike the conventional case, and the measurement accuracy is improved. . Further, if the first measuring device is used, it is possible to measure the dimensions L1, L2, and H without the operator holding the first ruler just by bridging the first ruler between the jigs, so that the reading accuracy is improved. Therefore,
It is possible to reduce the variation in the measurement results among the workers, and it is not necessary for the workers to have a skilled experience.

Further, when the extra length of the electric wire is obtained by assuming that the triangle having the vertices P1, P2 and P3 as an isosceles triangle in which the hypotenuses A and B have the same length, the extra length of the electric wire is obtained. In addition, the extra length can be calculated with only two equations.

[Brief description of drawings]

FIG. 1 is a perspective view of a measuring instrument according to a first embodiment of the present invention.

FIG. 2 is a drawing showing a measurement state.

FIG. 3 is a conceptual diagram for calculating a surplus length amount.

FIG. 4 is a perspective view of a measuring device according to a second embodiment.

FIG. 5 is a diagram showing a measurement state.

FIG. 6 is a conceptual diagram for calculating a surplus length amount.

FIG. 7 is a view showing a state in which the wire harness is wired on an assembly workbench.

8A is a drawing showing slack of an electric wire, FIG. 8B is an explanatory view of a conventional extra length measuring means, and FIG. 8C is an explanatory view of another conventional extra length measuring means. .

[Explanation of symbols]

10, 20 Measuring instrument 11, 21 First ruler 11a, 21a scale 12, 22 Second ruler 12a frame part 12b window 12d scale G1, G2 jig W electric wire Wa slack

Claims (4)

[Claims] 1. At the time of tuning before manufacturing a wire harness, wires are laid while holding an electric wire with an electric wire receiving jig standing on an assembly workbench, and slack occurs in the electric wire between the electric wire receiving jigs. In this case, it is a method of tuning the wire cut length that measures the excess length and cuts the excess length from the wire to prevent slack, and the wire is bent between adjacent jigs on both sides. By pulling in the direction perpendicular to the wiring direction, and centering the jigs P1 and P2 on both sides.
And the tip P3 of the pulled electric wire as an apex, and P1-
Form a triangle with P2 as the base of length L and P1-P3 and P2-P3 as hypotenuses P1-P3 and P2-P3 of lengths A and B, respectively. Than P3
A wire cutting length tuning method in which the excess length of the wire to be cut is calculated from the height H up to the following formula. Wire extra length = (A-L1) + (B-L2) where L1 is the position of the perpendicular line P4 and P from P3 to the bottom.
The length L2 between 1 and 1 is the length between the positions P4 and P2 of the perpendicular line drawn from P3 to the bottom. 2. An electric wire loosened between the jigs is pulled in a direction orthogonal to the center of the bottom side between the jigs to form the wires P1, P2, P.
Forming an isosceles triangle with 3 as the apex, the hypotenuses A and B
The electric wire cut length tuning method according to claim 1, wherein the extra length of the electric wire is obtained with the same length. 3. A measuring instrument used in the wire cutting length tuning method according to claim 1, wherein a first ruler for measuring a bottom dimension is attached between adjacent jigs, and slides on the first ruler. A second ruler for height measurement that freely projects in the orthogonal direction is attached, the second ruler is positioned so as to pass through the point P3, and the dimensions L1 and L2 are set.
A measuring instrument for tuning the electric wire cutting length, in which H and H are determined by the first and second rulers. 4. A measuring instrument used in the wire cutting length tuning method according to claim 2, wherein a first ruler for measuring a bottom dimension is attached between adjacent jigs, and a center position of the first ruler. The second ruler for height measurement is projected in a more orthogonal direction, and the electric wire is pulled in the orthogonal direction so that the P3 is located at a position passing through the second ruler.
A measuring instrument for tuning the wire cutting length, which is required by the first ruler and the second ruler.