JPH0786402B2 - Dimension measurement method of terminal crimp - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for measuring the size of a terminal crimping portion of a terminal fitting crimped to an electric wire terminal portion obtained by removing an insulating coating, and particularly to a terminal crimping portion. The present invention relates to a method for measuring the size of a terminal crimped portion, which enables highly accurate measurement of height and width.

"Prior art" Conventionally, terminal fittings (hereinafter referred to as terminals) are attached to the ends of electric wires.
In the process of crimping, remove the insulation coating from the end of the wire measured and cut to the specified length, and then crimp and attach the terminal with the specified size and shape to the end of this wire. There is.

By the way, when connecting the core wire of the wire and the terminal by crimping, the connecting part must be in perfect electrical continuity, and it must have a gripping force equivalent to the tensile strength of the wire. I have to. That is, it is necessary to perform pressure bonding that has good electrical and mechanical properties. This is because if the crimping is incomplete, there is a gap between the terminal and the core wire, so that conduction is incomplete, and the gripping force becomes small so that the core wire easily comes off. On the other hand, in the case of over-compression bonding, the cross-sectional area of the core wire is reduced, so that the core wire is easily broken. As described above, when crimping the terminal to the electric wire, it is necessary to crimp with an optimum crimping amount. In this case, the crimping amount is generally calculated by the crimping rate expressed as a percentage of the core wire cross-sectional area after crimping with respect to the core wire cross-sectional area before crimping, and the optimum amount is said to be 75 to 90%. It is being appreciated.

By the way, when managing this crimping amount at the production site,
As shown in FIG. 3, this is generally used because the method of evaluating the height CH and the width CW of the connecting portion between the core wire 2 of the electric wire 1 and the terminal 3, that is, the terminal crimping portion 4, is relatively easy. Has been. In FIG. 3, reference numeral 3a is a connecting portion for connecting to other terminals (not shown) and the like, and 3b is an insulator crimping portion for crimping the terminal 3 in the insulator portion of the power supply 1. Incidentally, FIG. 4 shows a cross-sectional view taken along the line I-I of FIG.

Here, FIG. 5 is a plan view showing a dimension measuring jig to which a conventional terminal crimping dimension measuring method is applied, and FIG. 6 is a side view of the same apparatus. In these figures, 10 is a clamp lever for fixing the terminal crimping portion 4 of the terminal 3, and 11 is a fixed clamp for fixing the terminal crimping portion 4 together with the clamp lever 10. 12 is a mount for supporting the bottom surface of the terminal crimping part 4 and fixing the terminal crimping part 4 together with the clamp lever 10 and the fixed clamp 11 (see FIG. 6), and 13 is a base for fixing the mount 12 , 14a, 14b are fixing blocks for fixing the base 13 at a predetermined position, 15a, 15b are width measuring elements for measuring the width CW of the terminal crimping portion 4, 16 is a height CH of the terminal crimping portion 4. It is a height gauge for measuring. Here, FIG. 7 is a sectional view taken along line II-II of FIG. In this figure, 17 is a bolt for fixing the fixed clamp 11 to the base 13, 18 is a shaft for rotatably supporting the clamp lever 10, 19 is a compression coil spring for pushing the clamp lever 10 upward in the drawing, 20 Is a bolt for supporting the compression coil spring 19 from below, and 21 is a bolt for fixing the bolt 20 to the base 13. In this case, the portion of the clamp lever 10 that comes into contact with the terminal 3 is the compression coil spring 19, the bolts 20,2.
It is urged to the stage 12 side by 1. The above-mentioned clamp lever 10, fixed clamp 11, stage 12, base 13,
Fixed blocks 14a, 14b, width measuring elements 15a, 15b, height measuring element 1
6, the bolts 17, 20, and 21, the shaft 18, and the compression coil spring 19 constitute a dimension measuring jig 22.

In the dimension measuring jig 22 configured in this way, the left end of the clamp lever 10 in the drawing (see FIG. 7) is pushed downward, the tip of the lever 10 is separated from the stage 12, and then between them. After inserting the terminal 3, the operation of the crank lever 10 is released, and the terminal 3 is fixed to the lever 10, the fixed clamp 11 and the stage 12 at three points. Then, after fixing the terminal 3, first, the height CH of the terminal crimping portion 4 of the terminal 3 is measured. That is, the position (zero setting) when the height measuring element 16 is brought into contact with the stage 12 and the terminal 3 is fixed to the dimension measuring jig 22 without fixing the terminal 3 to the dimension measuring jig 22 in advance. In this state, the height CH of the terminal crimping portion 4 is measured by calculating the distance from the position when the height measuring element 16 is brought into contact with the terminal crimping portion 4.

Subsequently, after measuring the height of the terminal crimped portion 4, the width CW of the terminal crimped portion 4 is measured. That is, the width CW of the terminal crimping portion 4 is calculated by calculating the distance between the width gauges 15a and 15b when they are brought into contact with the terminal crimping portion 4 with the terminal 3 fixed to the dimension measuring jig 22. taking measurement.

[Problems to be Solved by the Invention] By the way, when fixing the terminal crimping portion 4 using the dimension measuring jig 22 to which the above-described conventional terminal crimping dimension measuring method is applied, as shown in FIG. There is a possibility that the caulking portion 4 may be tilted and fixed with respect to the stage 12. In this case, the height CH and the width CW obtained by bringing the height measuring element 16 and the width measuring elements 15a and 15b into contact with the terminal caulking portion 4 include a measurement error due to the inclination.

Similarly, when fixing the terminal crimping portion 4 using such a dimension measuring jig 22, as shown in FIG. 9, the terminal crimping portion 4 of the terminal 3 includes the connecting portion 3a and the insulator crimping portion.
In general, the cross-sectional shape and the length dimension thereof are smaller than those of the connecting portion 3a and the insulator caulking portion 3b as well as the portion disposed between the connecting portion 3a and the insulating caulking portion 3b. Further, when measuring the dimensions of the terminal crimping portion 4, when fixing the terminal, the terminal crimping portion 4 itself does not depend on the connection portion 3a and the insulator crimping portion 3b which are only press-molded to improve the measurement accuracy. Need to be fixed. Therefore, the fixed clamp 10 and the clamp lever that press the terminal crimping portion 4
As shown in FIG. 9, 11 must be set to a width dimension smaller than the length of the terminal crimping portion 4. Therefore, the terminal crimping portion 4 may be fixed while being inclined with respect to the width measuring elements 15a and 15b. In this case, the width CW obtained by bringing the width measuring elements 15a and 15b into contact with the terminal caulking portion 4 as shown in FIG.
The inclination causes a measurement error.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a method for measuring the size of a terminal crimping portion, which can measure the height CH and the width CW of the terminal crimping portion 4 with high accuracy.

"Means for Solving the Problem" The present invention relates to a mounting table for mounting a terminal caulking portion arranged between a connecting portion of a terminal fitting crimped to an end portion of an electric wire and an insulating caulking portion, and a mounting table for mounting the terminal caulking portion. The terminal is provided by a fixed clamp that abuts an inclined plane disposed above the platform on one side surface of the terminal caulking portion, and a clamp lever having an inclined plane that abuts the other side surface of the terminal caulking portion. The terminal crimping portion is fixed by a predetermined frictional force generated at each contact portion by sandwiching the crimping portion, and then the height measuring element is brought into contact with the upper portion of the terminal crimping portion and both side surfaces of the terminal crimping portion. When the measurement surfaces of the two width measuring elements arranged in the same plane as the height measuring element, which are arranged to face each other, are brought into contact with each other and the respective measured values obtained at that time and the terminal crimping portion are not fixed. Based on each measurement value obtained in In the method for measuring the size and height of the terminal crimped portion based on the above, in the method for measuring the terminal crimped portion, after fixing the terminal crimped portion, the terminal crimped portion is displaced against the frictional force. The height gauge is brought into contact with the upper portion of the terminal caulking portion with a pressing force determined based on the frictional force for making the inclination with respect to the platform zero, and then the terminal caulking portion is opposed to the frictional force. Then, the measuring surface of each of the width measuring elements is brought into contact with the terminal caulking portion with a pressing force determined based on the frictional force for zeroing the inclination of the width measuring element with respect to the measuring surface. Characterize.

"Operation" According to the method for measuring the size of the terminal crimped portion according to the present invention,
By sandwiching the terminal crimped portion with the stage, fixed clamp and clamp lever, the terminal crimped portion to be measured is roughly positioned with respect to the height gauge and the width gauge by the predetermined frictional force generated at each contact portion. Fixed to. After that, when the height gauge is pressed from above with a minimum pressing force for displacing the terminal crimping portion against the frictional force, that is, a pressing force determined based on the frictional force, the terminal crimping portion is mounted. It can be displaced to a position where the tilt is zero with respect to the platform. Further, similarly to the above, from this state, when both side surfaces of the terminal are horizontally pressed by the width measuring element with a pressing force determined based on the frictional force that displaces the terminal caulking portion against the frictional force, The caulking portion is displaced to a normal position where both sides of the width measuring element are brought into close contact with the measuring surface of each width measuring element, that is, a position where the inclination with respect to the width measuring element is zero.

In this case, since the height measuring element and the width measuring element are arranged in the same plane, it is possible to surely press the terminal caulking portion having a short length dimension to change its posture.
As a result, the terminal crimping portion is arranged in an accurate posture for measuring its height and width, and the height and width dimensions can be measured with high measurement accuracy.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of a dimension measuring apparatus to which a dimension measuring method for a terminal crimp portion according to an embodiment of the present invention is applied. In addition, in FIG. 3 and FIG.
Portions common to each of FIGS. 7 to 7 are denoted by the same reference numerals and the description thereof will be omitted.

In this figure, 25 is a plate-shaped base.
Reference numeral 26 denotes a jig fixing base for fixing the dimension measuring jig 22, and is attached to the base 25 at a substantially central portion on the front side of the drawing. Tightening bolts 27a,
27b are provided respectively, and by these, the height measuring element 1
The dimension measuring jig 22 is fixed so that each of 6 and the width measuring elements 15a and 15b comes into contact with a predetermined position of the terminal crimping portion 4. 28a and 28b are holders each formed in a rectangular shape,
Of these, the holder 28a is the spindle 30 of the width detector 29a.
The holder 28b supports the spindle 30b of the width detector 29b. Above spindle 30a
The width measuring element 15a is attached to the right end of the, and the width measuring element 15b is attached to the left end of the spindle 30b.
Reference numerals 31a and 31b are ball slides formed in a substantially rectangular shape. Among these, the above-mentioned holder 28a and width detector 29a are attached to the upper surface of the ball slide 31a, and the upper surface of the ball slide 31b is attached. The holder 28b and the width detector 29b described above are attached respectively. Reference numeral 32 is a slide guide for guiding the ball slides 31a, 31b in the horizontal direction in the drawing. 33a and 33b are stopper flanges formed in a substantially L shape, and of these,
The stopper flange 33a is attached to the surface of the ball slide 31a on the front side in the drawing (not visible in this figure), and the stopper flange 33b is attached to the surface of the ball slide 31b on the front side in the drawing (not visible in this figure). Has been. Further, a rod-shaped stopper 34a is horizontally attached to the left end of the stopper flange 33a in the drawing, and a stopper 34b having the same shape is also horizontally attached to the right end of the stopper flange 33b in the drawing. 35a, 35b
Is a stopper receiving flange formed in an L shape, among these, the stopper receiving flange 35a is attached to the upper right end of the width detecting air cylinder 36a, and the stopper receiving flange 35b is the width detecting air cylinder 36a. It is attached to the left edge of the top surface. Further, the stoppers 34a, 3b described above are provided on the upper portions of the stopper receiving flanges 35a, 35b, respectively.
Rod-shaped stopper receivers 37a and 37b are attached so as to face 4b. The width detecting air cylinders 36a, 36b described above are each formed in a rectangular shape. Among these, the width detecting air cylinder 36a has a built-in piston rod 38a protruding from the right side surface thereof, and the width detecting air cylinder 36a For air cylinder 3
The piston rod 38b protruding from the left side surface is built in the 6b. These piston rods 38a, 38b move the ball slides 31a, 31b in the horizontal direction in the drawing via stopper flanges 33a, 33b. Next, 39 is a height detector, 40 is a bracket for fixing the height detector 39 via a flange 41, and 42 is a spindle of the height detector 39 having the height probe 16 attached to its tip. , 43 is a lever whose one end is fixed to the height measuring element 16, 44 is an air cylinder for the height detector, and 45 is a height for moving the spindle 42 of the height detector 39 up and down via the lever 43. It is a piston rod of a detector air cylinder. 47 is a microcomputer, not shown CPU (central processing unit), RAM
(Random access memory), ROM (Read only memory), Interface circuit, etc. are included.
In this case, a program for controlling the CPU is written in the ROM. The microcomputer 47 reads the position information output from each of the height detector 39 and the width detectors 29a and 29b, and calculates the height CH and the width CW of the terminal caulking portion 4 based on these position information. Further, the microcomputer 47 uses a solenoid valve (not shown) so that each of the height measuring element 16 and the width measuring elements 15a, 15b applies a predetermined pressing force (hereinafter referred to as measuring force) to the terminal crimping portion 4. Piston rod of air cylinder 44 for height detection by controlling opening / closing
The movement of 45 and the movement of the width detecting air cylinders 36a and 36b are controlled. That is, when the terminal crimping portion 4 is fixed to the dimension measuring jig 22 while being tilted, the height measuring element 16 and the width measuring element
This is because the inclinations can be corrected by pressing the crimped portions 4 by the same portions 15a and 15b.

Here, the measuring force applied to the terminal caulking portion 4 of each of the height measuring element 16 and the width measuring elements 15a and 15b will be described.

First, the measuring force applied to the terminal crimping portion 4 of the height measuring element 16 will be described.

For example, the clamp lever 10 and the fixed clamp 11 of the inclination angle α terminal crimping unit 4 at an angle of β with respect to workpiece stage 12 dimension measurement jig 22 as shown in FIG. 8, the clamping force F ₁ The relationship between the clamping force F ₁ and the reaction forces F ₂ and F ₃ generated on the mounting table 12 and the mounting table 12 when it is fixed by can be expressed by the following equation.

F ₁ / sin θ ₁ = F ₂ / sin θ ₂ = F ₃ / sin θ ₃ (1) where θ ₁ , θ ₂ and θ ₃ are angles indicating the directions in which F ₁ , F ₂ and F ₃ act. , Θ ₁ = π−α−β, θ ₂ = π−α + β, θ ₃ = 2α
(2) Can be solved.

In this way, when the terminal caulking portion 4 is fixed to the dimension measuring jig 22 with the angle β, when the height measuring element 16 contacts the caulking portion 4 with the measuring force Fmh, the stage 12 of the caulking portion 4 is fixed. The terminal crimping portion 4 moves in a direction in which the tilt angle β with respect to the angle approaches zero. At this time, when frictional force is generated on the contact surfaces of the crimping portion 4, the clamp lever 10, the fixed clamp 11 and the stage 12 in the direction in which the movement of the terminal crimping portion 4 is disturbed, the frictional force in the vertical and horizontal directions is generated. The total frictional forces Fy and Fx can be expressed as follows.

_{Fy = -μ 1 F 1 cosγ +} μ 2 F 2 cosγ + μ 3 F 3 sinβ (3) Fx = -μ 1 F 1 sinγ + μ 2 F 2 sinγ + μ 3 F 3 cosβ (4) where, γ = π / 2-α , μ ₁ , μ ₂ and μ ₃ are friction coefficients at the contact surfaces of the terminal crimping portion 4, the clamp lever 10, the fixed clamp 11 and the stage 12.

Then, by substituting the equations (1) and (2) into the equations (3) and (4) and rearranging, Fy and Fx are as follows.

Therefore, if the frictional force at the contact surface between the height measuring element 16 and the terminal crimping portion 4 is μn, the mounting table of the terminal crimping portion 4 can be obtained.
The condition for correcting the inclination angle β with respect to 12 is Fmh ≧ Fy and μnFmh ≧ Fx (7). In this way, the measuring force applied to the terminal caulking portion 4 of the height measuring element 16 is obtained.

Next, the measuring force applied to the terminal caulking portion 4 of each of the width measuring elements 15a and 15b will be described.

Now, after the height measuring element 16 comes into contact with the terminal caulking portion 4 and its inclination with respect to the stage 12 is corrected, the terminal caulking portion 4 becomes the width measuring elements 15a and 15b as shown in FIG. 9, for example. On the other hand, if it is fixed by the dimension measuring jig 22 and the height measuring element 16 with an inclination of δ, each of the width measuring elements 15a and 15b has a measuring force F
When contacting the terminal crimping part 4 with mw, these measuring force
The points of action of Fmw are points P and Q as shown in the figure, and they are displaced in the front-rear direction. Therefore, a couple of forces centering on the point O is generated. Then, due to the action of this couple, the width measuring element 15
When the terminal crimping portion 4 moves in a direction in which the inclination angle δ with respect to a and 15b approaches zero, the crimping portion 4, the height measuring element 16, the clamp lever 10, and the stage 12 are also in the same direction as the movement of the terminal crimping portion 4 is hindered. If frictional force occurs on the contact surface with each,
The sum M ₀ of moments due to the frictional forces centering on the point O is given by the following equation.

M ₀ = μn ′ · Fmh · l + Fcr · L (8) where μn ′ is the contact between the height gauge head 16 and the terminal crimping portion 4 after the inclination of the terminal crimping portion 4 with respect to the stage 12 is corrected. The coefficient of friction on the surface, l is the thickness of the width gauges 15a, 15b, and L is the distance between the width gauges 15a, 15b and the clamp lever 10. Also, Fcr is the terminal caulking part 4 and the clamp lever 1
0 is the sum of the left and right components of the frictional force generated on the contact surface with 0 and the stage 12. The friction coefficient of the contact surface between the caulking portion 4 and the clamp lever 10 after the inclination of the terminal caulking portion 4 with respect to the stage 12 is corrected is μ ₁ ′. If the friction coefficient at the contact surface with is ₃ ', then Fcr is as follows.

Fcr = (2μ ₃ ′ + μ ₁ ′) · F ₁ cosα (9) Therefore, if the couple force Fmw · l due to the measuring force Fmw is larger than the total moment M ₀ due to the friction force, the terminal caulking portion 4
The inclination angle δ with respect to the width measurements 15a and 15b can be corrected. The condition at this time is obtained as Fmw · l ≧ M ₀ (10). In this way, the measuring force applied to the terminal crimping portions 4 of the width measuring elements 15a and 15b is obtained.

As described above, by setting the clamping force F ₁ and the measuring forces Fmh and Fmw so as to satisfy the equations (7) and (10), the terminal caulking portion 4 causes the stage 12 and the width measuring element 15a. Even when fixed at an angle to 15b, the width probe 15a,
At the same time that 15b contacts the terminal crimping portion 4, the inclination can be corrected. Therefore, it is possible to perform accurate measurement without including an error due to the inclination.

The measuring force Fmw can also be adjusted by changing the positions of the width detector stoppers 34a and 34b.

Next, the operation of the above-described dimension measuring device will be described.

Now, after fixing the terminal 3 to the dimension measuring jig 22, when a measurement start switch (not shown) is turned on, the microcomputer 47 moves the piston rod 45 of the height detector air cylinder 44 downward. The height measuring element 16 attached to the lever 43 is brought into contact with the terminal crimping portion 4. In this case, since the measuring force Fmh satisfying the above formula (7) is applied to the terminal crimping portion 4 from the height probe 16, even if the crimping portion 4 is tilted and fixed with respect to the stage 12, The inclination is corrected to zero. Next, the microcomputer 47 moves the piston rod 38a of the width detector air cylinder 36a to the right after contacting the height gauge 16 with the terminal crimping portion 4, and at the same time, moves the width detector air cylinder.
The piston rod 38b of 36b is moved to the left to bring the width gauges 15a and 15b attached to the spindles 30a and 30b into contact with the terminal caulking portion 4. In this case, the above (10)
Since the measuring force Fmw that satisfies the formula is applied to the terminal crimping portion 4 from each of the width crimping portions 15a, 15b, the terminal crimping portion 4 is
Even if the dimension measuring jig 22 and the height measuring element 16 are tilted with respect to a and 15b and fixed, the tilt is corrected to be zero. Then, the microcomputer 47 has the width measuring element 15
After contacting each of the terminals a and 15b with the terminal crimping portion 4, the position information output from each of the height detector 39 and the width detectors 29a and 29b is read, and the position information and each detector in the zero setting state in advance are read. The height CH and the width CW of the terminal crimping portion 4 are calculated based on the position information obtained from 39 and 29a, 29b.

Here, for reference, Fig. 2 shows the height CH and width CW of the terminal crimping part of a certain terminal for five cases with different crimping conditions.
Is the result of measurement by the dimension measuring device. As shown in this figure, it can be seen that fairly good repeatability is obtained.

In the above embodiment, the height CH and the width CW of the terminal crimped portion 4 are described as an example. However, even when the height and width of the insulation-covered crimped portion of the terminal 3 are measured, this embodiment is also used. It is needless to say that the dimension measuring device can be applied.

"Effects of the Invention" As described above, according to the method for measuring the size of the terminal caulking portion of the present invention, the height measuring element is caulked with the pressing force for making the inclination of the terminal caulking portion with respect to the mounting table zero. Since the terminal contact caulking portion is contacted with the terminal crimping portion with a pressing force for zeroing the inclination of the terminal crimping portion with respect to the width crimping portion, Even if the table is tilted and fixed with respect to the stage and the width measuring element, the tilt is corrected to be zero. In this case, the pressing force is set with reference to the frictional force generated in the clamp, etc., so the minimum necessary optimum pressing force to displace the terminal caulking portion against this frictional force is applied to the terminal caulking portion. It is possible to perform the measurement without causing deformation of the caulked portion of the terminal. Therefore, the height and width of the terminal crimped portion can be measured with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outer appearance of a dimension measuring apparatus to which a terminal crimping dimension measuring method according to an embodiment of the present invention is applied.
FIG. 2 is a view showing a measurement result by the same apparatus, FIG. 3 is a perspective view showing an outer appearance of a terminal fitting, FIG. 4 is a sectional view taken along the line II of FIG. 3, and FIG. 5 is a conventional terminal caulking portion. Fig. 6 is a plan view showing a measuring jig to which the dimension measuring method of Fig. 6 is applied, Fig. 6 is a side view of the jig, Fig. 7 is a sectional view taken along the line II-II of Fig. 5, and Figs. FIG. 6 is a diagram for explaining a problem of the dimension measuring jig to which the dimension measuring method of the terminal crimped portion is applied. 1 ... Electric wire, 2 ... Core wire, 3 ... Terminal fitting, 4 ... Terminal crimping part, 10 ... Clamp lever, 11 ... Fixed clamp, 12 ... Mounting base, 13 ... Base, 14a, 14b …… Fixed block, 15a, 15b …… Width probe, 16 …… Height probe, 17 …… Bolt, 18 …… Axis, 19 …… Compression coil spring, 20,21 …… Bolt, 22 …… Dimension measuring jig, 25 …… base, 26 …… fixture base, 27a, 27b …… tightening bolts, 28a, 28b …… holder, 29a, 29b …… width detector, 30a, 30b …… spindle, 31a , 31b …… Ball slide, 32 …… Slide guide, 33a, 33b …… Stopper flange, 34a, 34b …… Stopper, 35a, 35b …… Stopper receiving flange, 36a, 36b …… Width detection air cylinder, 37a, 37b …… Stopper receiver, 38a, 38b …… Piston rod, 39 …… Height detector, 40 …… Bracket, 41 …… Flange, 42 …… Spindle, 43 …… Lever , 44 ...... height detecting air cylinder, 45 ...... piston rod.

Claims (1)

[Claims] 1. A mounting table on which a terminal caulking portion is mounted, which is arranged between a connecting portion of a terminal fitting crimped to an end portion of an electric wire and an insulating caulking portion, and arranged above the mounting table. By holding the terminal crimped portion by a fixed clamp that abuts a slanted flat surface on one side surface of the terminal crimped portion and a clamp lever having a slanted flat surface that is abutted on the other side surface of the terminal crimped portion. The terminal crimping portion is fixed by a predetermined frictional force generated at the contact portion, and then the height measuring element is brought into contact with the upper portion of the terminal crimping portion, and both side surfaces of the terminal crimping portion are the same as the height measuring element. The respective measurement values obtained at that time by bringing the measurement surfaces of the two width measuring elements arranged in the plane facing each other into contact with each other and the measurement values obtained when the terminal crimping portion is not fixed Based on the height of the terminal crimped part In the method for measuring the size of the terminal crimping portion for measuring the width and the width, after fixing the terminal crimping portion, the terminal crimping portion is displaced against the frictional force to make the inclination with respect to the object platform zero. The height measuring element is brought into contact with the upper portion of the terminal crimping portion with a pressing force determined based on the frictional force of the terminal, and then the terminal crimping portion is displaced against the frictional force to obtain the width measuring element. Measuring the dimension of the terminal crimping portion, wherein the measuring surface of each of the width measuring elements is brought into contact with the terminal crimping portion with a pressing force determined based on the frictional force for making the inclination of the terminal crimping portion zero with respect to the measuring surface. Method.