JPS6338656B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending resistance tester for appropriately measuring the bending resistance of materials.

In general, the sole of a shoe shoe bends considerably when walking or running, so in order to improve the functionality of the shoe shoe, it is important to know the bending resistance of the material that makes up the shoe sole.

Here, the bending resistance refers to the reaction force generated by bending the shoe sole, for example, and is equal to the force necessary for bending.

JIS・L-1079 is used as a material bending tester.
The methods specified in JIS P-8125 and JIS K-7203 have been known for a long time. Since it is for measurement, it cannot measure thick materials made of rubber or sponge, such as suse materials. Also,
Since this testing machine performs bending tests on rigid materials such as plastic plates, the bending angle is small and it cannot be used for bending tests on used materials.

By the way, various studies have been conducted to measure the bending resistance of shoe soles, but when a thick material is bent, a large elongation occurs on the outside of the bend, and that elongation resistance is added to the bending resistance. There are many disadvantages such as this, and there are no testing machines that can accurately measure bending resistance.

Therefore, an object of the present invention is to provide a bending resistance tester that can accurately measure the bending resistance of thick materials such as shoe soles.

To achieve the above object, according to the present invention, a fixed support and a movable support having a load detection section are arranged in parallel, and a test material placed astride both supports is sandwiched between each support. A clamp is provided to support the support shaft provided on both rear sides of the movable support base so as to be rotatable and movable in the horizontal direction, and a drive device is provided for moving the front part of the movable support base up and down. After the test material placed across both supports is immovably supported with a clamp, the test material is bent by rotating the movable support, and the bending load is detected by the load detector on the movable support. It was designed to do so.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, a fixed support base 2 is mounted on a table 1, and a movable support base 3 is arranged in front of the fixed support base 2. As shown in FIGS. Further, a load detection section X is provided at the rear of the movable support base 3. In the illustrated embodiment, a support plate 5 is provided on the rear upper side of the movable support base 3 via a plurality of load cells 4, and the support plate 5 is supported at approximately the same level as the fixed support base 2.

The test material is placed so as to straddle the fixed support table 2 and the support plate 5, and is immovably supported by clamps 6, 7, and 8 provided on the fixed support table 2 and the support plate 5, respectively. be done.

Two clamps 6 and 7 are provided on the fixed support base 2, and one of the clamps 6 is provided with a guide extending long in the width direction of the support base 2 on the fixed support base 2, as shown in FIG. A member 10 is provided, and a threaded rod 12 is threadedly engaged with a support block 11 that is slidable along the guide member 10.
A pad 13 is attached to the lower end of the. The other clamp 6 has a gate-shaped support frame 14 on the fixed support base 2, and a piston rod 17 of a cylinder 16 supported by a horizontal bar 15 of the support frame 14 is attached to a presser body such as a roller having a rounded outer periphery. 18 is installed.

Furthermore, a fourth clamp 8 provided on the support plate 5
As shown in the figure, guide holes 19 are provided on both sides of the support plate 5 and extend in the direction of the fixed support base 2,
A threaded rod 21 is erected from slide blocks 20, 20 provided so as to be adjustable in position along the guide hole 19, and a rod 23 is inserted between rod support pieces 22, 22 provided slidably along each threaded rod 21. A spring 24 that presses the rod support piece 22 downward is fitted into each of the threaded rods 21, and a nut 29 for adjusting the elasticity of the spring 24 is screwed into engagement.

The movable support table 3 includes a pair of support shafts 25, 25 extending laterally from both rear sides of the top surface, and bearings 26 that rotatably support each support shaft 25 are mounted on both sides of the top surface of the table 1. It is provided to be slidable along a pair of guide shafts 37, 37 that intersect with the support shaft 25, and an angle sensor 28 for detecting the rotation angle of the support shaft 25 is attached to one of the bearings 26 (see Fig. 2). and Figure 4).
This movable support base 3 is configured to rotate around a support shaft 25 by the operation of an elevating drive device 30 that moves its front portion up and down. Any device can be used as the lifting device 30, but here, as shown in FIG.
A disk 33 is attached to the end of a rotating shaft 32 that is rotationally driven by a rod 3 on the outer circumference of the disk 33.
A roller 35 attached to the other end of the rod 34 is fitted into a guide hole 36 provided at the front of the movable support base 3.

The bending resistance tester shown in the example has the above-mentioned structure, in which a test material is placed so as to straddle the fixed support stand 2 and the support plate 5, and the test material is placed between the clamps 6, 7 and 8, and in such a state, the movable support table 3 is rotated to measure the bending resistance of the test material.

Now, place the shoe A so that it straddles the fixed support base 2 and the support plate 5, and hold the bottom B of the shoe A between the fixed support base 2 using the clamps 6 and 7. When the toe of A is clamped between the clamp 8 and the support plate 5 and the lifting drive device 30 is activated to move the tip of the movable support 3 upward, the movable support 3 moves the support shaft 25. Rotate upwards around the center. Therefore, the tip of the shoe bottom B is bent around the portion held by the clamp 7. At this time, the inner side of the bent part of the shoe bottom contracts while the outer side expands, and due to this extension, the movable support base 3 moves in a direction away from the fixed support base 2 along the guide shaft 37 (the first (See Figure 6). Therefore, the resistance due to the extension of the shoe bottom B does not act on the support plate 5, and the force against the bending of the tip of the shoe acts on the support plate 5, and the bending resistance compresses and deforms each load cell 4. The bending resistance of the sheath can be determined by the change in electrical resistance due to strain in the load cell 4.

In addition, by rotating the movable support base 3,
The rotation angle of the movable support base 3 is measured by the angle sensor 28, and the bending resistance corresponding to the bending angle of the shoe bottom B can be determined.

In addition, in the case of the example, the test material was Sew's, but the test material is limited to this, and the bending resistance of any material can be measured.

Further, in the embodiment, the load detection section X includes a load cell 4 provided between the support plate 5 and the movable support base 3, but the load detection section X is not limited to this. For example, by omitting the support plate 5 shown in FIG. 3 and extending the movable support base 3 to the position of the support shaft 25, and attaching a strain gauge directly to the rear part of the movable support base 3, the strain gauge may be moved when bending the test material. The reaction force due to bending of the test material may be measured by distorting the strain gauge due to the deflection of the support base.

As described above, according to the present invention, the test material placed astride the fixed support and the movable support and immovably supported by the clamp is bent by the rotation of the movable support. Then, an elongation occurs on the outside of the bent part of the test material, and this elongation causes the support plate to move away from the fixed support together with the movable support. Only the reaction force due to bending of the test material acts, and as a result, only bending resistance acts on the load detection section, making it possible to accurately measure the bending resistance of the test material.

In addition, the movable support base can be rotated in the forward and reverse directions at the set angle by the operation of the lifting drive device, so the test material can be repeatedly bent, and the fatigue life of the test material can also be measured. be able to.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the testing machine according to the present invention, FIG. 2 is a plan view of the same, and FIG. FIG. 4 is a perspective view showing the support portion of the movable support base, FIG. 5 is a sectional view showing an enlarged part of FIG. 3, and FIG. 6 is a sectional view showing the operating state of FIG. 5. 2...Fixed support base, 3...Movable support base, 5...
Support plate, 6, 7, 8... Clamp, 25... Support shaft.

Claims (1)

[Claims] 1. A movable support base having a load detection unit is placed in front of the fixed support base, and a clamp is provided to clamp the test material placed across both support bases, and the movable support base is fixed. A support shaft is provided on both sides of the rear side of the support base, and this support shaft is rotatably supported by a bearing supported so as to be movable only in the arrangement direction of the fixed support base and the movable support base. A bending resistance tester equipped with a drive device that moves the front part up and down.