Material testing machine

Abstract

To provide a material testing machine capable of accurately reproducing pressing force required for clamping.SOLUTION: A material testing machine (1) includes: an actuator (30) for loading a test piece (TP); a support member (14) for supporting the actuator (30) or the test piece (TP) and supported by a shaft member (12); and a clamp mechanism (70) for clamping the support member (14) to the shaft member (12). The clamp mechanism (70) includes an elastic member unit (80) having an elastic member (83) which is previously elastically deformed in advance with a predetermined compressive force. By pressing the elastic member unit (80) with a pressing screw (76), the support member (14) is clamped to the shaft member (12).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a material testing machine.

Background Art

[0002] Conventionally, in a material testing machine, a structure is known in which a crosshead as a support member is clamped to a column as a shaft member (see, for example, Patent Document 1). Patent Document 1 describes a material testing machine in which the crosshead can move up and down with respect to the column by rotating a handle, and a configuration in which the crosshead is clamped to the column by tightening a split groove of the crosshead with a bolt is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when manually tightening and clamping a bolt, the pressing force is usually controlled by torque. However, in torque control, the accuracy of the pressing force is generally not very high, and there is a problem that variations in the pressing force are likely to occur. In addition, there is also a device provided with a lever for supporting the tightening by a bolt. However, even if the lever position is the same, variations in the pressing force have occurred. The present invention has been made in view of the above circumstances, and an object thereof is to provide a material testing machine capable of accurately reproducing the pressing force required for clamping.

Means for Solving the Problems

[0005] Aspects of the present invention include an actuator that applies a load to a test piece, a support member that supports the actuator or the test piece and is supported by a shaft member, and a clamping mechanism that clamps the support member to the shaft member. The clamping mechanism includes an elastic member unit having an elastic member that is elastically deformed in advance with a predetermined compressive force. By pressing the elastic member unit with a pressing screw, the support member is clamped to the shaft member. The present invention relates to a material testing machine.

Advantages of the Invention

[0006] According to aspects of the present invention, the elastic member is elastically deformed in advance, and if the pressing screw can be rotated, it can be clamped by a pressing force equal to or greater than a predetermined compressive force via the elastic member unit. For this reason, conventionally, the pressing force was generated from the torque due to the rotation of the screw and the pressing force varied. However, in the aspects of the present invention, the rotation of the pressing screw is converted into the movement of the tip, and the movement of the tip is converted into the elastic force that is the pressing force. Therefore, the pressing force required for clamping can be accurately reproduced. In addition, in material testing, reproducibility is often required. On the other hand, the fixing of the shaft member that affects the test is not sensed, which may lead to variations in test results that are not visible to the eye. According to aspects of the present invention, it becomes possible to provide highly reproducible test results.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0009] [1. Embodiment] FIG. 1 is a view of a material testing machine 1 according to an embodiment. The material testing machine 1 of the present embodiment is an electromagnetic material testing machine that performs a material fatigue strength test using a resin film or a metal foil as a test piece TP.

[0010] The material testing machine 1 includes a load frame 10, an electromagnetic actuator 30 supported by the load frame 10, a test jig 50 disposed opposite to the electromagnetic actuator 30, and a control device 100 that controls the electromagnetic actuator 30. In the present embodiment, with reference to the material testing machine 1 shown in FIG. 1, the vertical direction FD, the horizontal direction SD, and the front-rear direction TD (see FIG. 2) are used. The vertical direction FD, the horizontal direction SD, and the front-rear direction TD are orthogonal to each other.

[0011] The material testing machine 1 has a table 11. On the upper part of the table 11, a pair of columns (shaft members) 12 extending in the vertical direction FD are erected. At the upper ends of the columns 12, a yoke 13 disposed between the columns 12 is supported. A crosshead (support member) 14 is supported by the pair of columns 12 so as to be movable in the vertical direction between the table 11 and the yoke 13. The table 11, the pair of columns 12, and the crosshead 14 constitute a load frame 10 for applying a load to the test piece TP.

[0012] On the front surface of the crosshead 14, a lifting handle 15 is provided. The lifting handle 15 is fixed to a rotating shaft 15a extending in the front-rear direction. The rotating shaft 15a is rotatably supported by the crosshead 14. A drive transmission portion (not shown) is provided at the inner end of the rotating shaft 15a. The drive transmission portion transmits the rotational movement of the lifting handle 15 to pinion gears (not shown) provided facing the respective left and right support columns 12. These pinion gears mesh with rack teeth (not shown) provided along the support columns 12. Therefore, by rotating the lifting handle 15, the crosshead 14 moves up and down along the pair of support columns 12. The vertical position of the crosshead 14 in the vertical direction FD is fixed by clamp mechanisms 70 provided at both ends of the pair of left and right crossheads 14.

[0013] An electromagnetic actuator (actuator) 30 is supported by the crosshead 14. The electromagnetic actuator 30 drives the piston rod 31 in the vertical direction FD by electromagnetic force. Inside the casing 32 of the electromagnetic actuator 30, a coil and a magnet (not shown) are built in, and by controlling the current flowing through the coil, the piston rod 31 is driven and the test force is controlled. That is, the electromagnetic actuator 30 is a force control type actuator that can apply a constant excitation force corresponding to a drive signal to the test piece TP.

[0014] The piston rod 31 is arranged in a state of penetrating the casing 32 in the vertical direction. A displacement sensor 33 is attached to the upper end of the piston rod 31. The displacement sensor 33 detects the displacement of the piston rod 31 (the displacement of the upper end of the piston rod 31) and outputs it to the control device 100.

[0015] A bending tool 35 is supported via a load cell 34 at the lower end of the piston rod 31. The load cell 34 detects the load and outputs it to the control device 100.

[0016] Opposite to the bending tool 35, a test jig 50 is disposed on the table 11. The test jig 50 of the present embodiment is a test jig for a bending fatigue test. That is, it has a pair of support portions 51 in the left - right direction SD and a holding portion 52 provided outside the left - right direction SD of the support portions 51. A test piece TP is placed on the test jig 50.

[0017] Therefore, when the piston rod 31 descends, the bending tool 35 of the piston rod 31 comes into contact with the test piece TP. In the state where the bending tool 35 and the test piece TP are in contact, since the displacement of the piston rod 31 and the displacement of the test piece TP coincide, the output signal of the displacement sensor 33 in the contact state represents the displacement of the test piece TP.

[0018] FIG. 2 is a cross - sectional view schematically showing a cross - section taken along line II - II of FIG. 1. FIG. 2 shows a clamp mechanism 70. Clamp mechanisms 70 are provided at both ends of the crosshead 14. The clamp mechanism 70 clamps the support column 12. Since the left and right clamp mechanisms 70 can be configured in the same way, the right - hand clamp mechanism 70 will be described below.

[0019] The crosshead 14 has a crosshead body 14a straddling between a pair of support columns 12. The crosshead body 14a is integrally formed. Recesses 14b for accommodating the support columns 12 are formed at the left and right ends of the crosshead body 14a. The recesses 14b are formed in an arc shape according to the outer peripheral surface of the support columns 12. On both sides of the recesses 14b in the front - rear direction TD, a pair of guide rods 72 extending in the left - right direction SD (the direction away from the crosshead body 14a) are supported.

[0020] A pair of guide rods 72 supports a block-shaped pressing member 73. The pressing member 73 has an outer appearance shape in which the crosshead body 14a extends in the left-right direction SD. A pair of through holes 73a are formed in the pressing member 73 in the front-rear direction TD. The guide rods 72 are inserted into the through holes 73a. The pressing member 73 is supported so as to be guidable along the guide rods 72 and is supported so as to be able to approach and separate from the support column 12. A concave portion 73b for accommodating the support column 12 is formed in the pressing member 73. The concave portion 73b is formed in an arc shape according to the outer peripheral surface of the support column 12. By the pressing member 73 pressing the support column 12, the support column 12 can be clamped. In the present embodiment, a clamping portion 71 for clamping the support column 12 is constituted by the crosshead body 14a, the guide rods 72, and the pressing member 73.

[0021] A plate-shaped screw holder (screw support member) 74 is fixed to the end of the guide rod 72. In the present embodiment, the screw holder 74 is fixed to the end of the guide rod 72 by fastening a bolt 75 to the end of the guide rod 72. A screw hole 74a penetrating in the left-right direction SD is formed in the screw holder 74. A pressing screw 76 is screwed into the screw hole 74a. The pressing screw 76 can move forward and backward with respect to the screw holder 74 by screwing in the tightening direction or the loosening direction. The pressing screw 76 is supported in a state of penetrating the screw holder 74. That is, the shaft portion 76a of the pressing screw 76 protrudes toward the pressing member 73 side from the screw holder 74.

[0022] Tension springs (biasing members) 77 are arranged at both ends of the screw holder 74. The tension springs 77 are attached to the screw holder 74 and the pressing member 73. The tension springs 77 bias the pressing member 73 in a direction away from the support column 12. The tension springs 77 are configured to apply a biasing force such that when no pressing force acts on the pressing member 73, the pressing member 73 separates from the support column 12 against the frictional force with the guide rod 72.

[0023] Figure 3 is a view showing the spring unit 80. A spring unit (elastic member unit) 80 is disposed between the pressing screw 76 and the pressing member 73. The spring unit 80 has a first clamping member 81 and a second clamping member (clamping member) 82 that are disposed opposite to each other.

[0024] The first clamping member 81 has a flat plate shape. On the inner surface of the first clamping member 81, a cylindrical holder portion 81a that protrudes toward the second clamping member 82 is provided. An elastic member 83 is mounted on the holder portion 81a. In the present embodiment, the elastic member 83 includes a plurality of annular disc springs 84. That is, the disc springs 84 are disposed on the first clamping member 81 with the holder portion 81a inserted into the holes 84a thereof. In the present embodiment, the disc springs 84 are stacked in a plurality of sheets with their orientations aligned. That is, the disc springs 84 are connected in parallel, so to speak. Hereinafter, in the present embodiment, the disc springs 84 connected in parallel are also referred to as the elastic member 83. A plurality of fastening holes 81b are formed in the first clamping member 81 on the outer peripheral side of the elastic member 83. Female threads are formed in the fastening holes 81b.

[0025] The second clamping member 82 has a flat plate shape. The second clamping member 82 clamps the elastic member 83 together with the first clamping member 81. A recess 82a that is recessed in a direction away from the first clamping member 81 is formed on the inner surface of the second clamping member 82. The recess 82a is larger than the cross-sectional area of the holder portion 81a of the first clamping member 81, and is configured such that the holder portion 81a can enter the recess 82a. Insertion holes 82b that penetrate the second clamping member 82 in the thickness direction are formed around the recess 82. The insertion holes 82b are formed at positions facing the fastening holes 81b of the first clamping member 81.

[0026] A retaining bolt 85 is inserted into the insertion hole 82b. The retaining bolt 85 includes a shaft portion 85a formed with a male thread and a head portion 85b having a larger diameter than the shaft portion 85a. The head portion 85b is formed to have a larger diameter than the insertion hole 82b. The shaft portion 85a of the retaining bolt 85 is fastened to the fastening hole 81b of the first clamping member 81. At this time, since the head portion 85b of the retaining bolt 85 has a larger diameter than the insertion hole 82b, the second clamping member 82 is prevented from coming off by the retaining bolt 85. Therefore, the second clamping member 82 can only move in a direction in which the distance from the first clamping member 81 is reduced, compared to the position where it abuts against the head portion 85b of the retaining bolt 85. In this state, the retaining bolt 85 is fastened by a predetermined amount. As a result, the maximum distance between the second clamping member 82 and the first clamping member 81 can be set to a predetermined distance. Therefore, by clamping the elastic member 83 between the second clamping member 82 and the first clamping member 81, the elastic member 83 can be compressed by a predetermined amount.

[0027] FIG. 4 is a diagram showing the relationship between the compression force f and the compression displacement δ of the spring unit 80. In FIG. 4, the horizontal axis represents the compression displacement δ, and the vertical axis represents the compression force f. The compression force (elastic force) of the elastic member 83 is proportional to the compression displacement, which is the displacement when it is compressed. Therefore, the compression force (elastic force) of the spring unit 80 is also proportional to the compression displacement δ. In the spring unit 80, the maximum distance between the second clamping member 82 and the first clamping member 81 is set to a predetermined distance by the retaining bolt 85, and the elastic member 83 is in a state where it has been pre-compressed in displacement. That is, a compression force f has been applied to the elastic member 83 in advance, and a pre-compression force f0 has been applied.

[0028] Here, in the clamping mechanism 70, when the pressing screw 76 is screwed in, the pressing screw 76 needs to apply a sufficient pressing force to the clamping part 71 to generate a clamping force, that is, a clamping force that prevents the crosshead 14 from moving when the material testing machine 1 applies a test load (the maximum test load in design). Therefore, the elastic member 83 is pre-compressed (elastically deformed) by a predetermined amount in a state of being pressed by the first clamping member 81 and the second clamping member 82 with this sufficient pressing force. In other words, the elastic member 83 is set so as not to be elastically compressed (elastically deformed) by the pressing screw 76 until the pressing force required for clamping acts. Therefore, the elastic member 83 does not undergo compressive displacement, and the spring unit 80 does not undergo compressive displacement unless a pressing force equal to or greater than the applied compressive force f0 acts.

[0029] In FIG. 2, in the spring unit 80, the first clamping member 81 is fixed to the pressing member 73. The first clamping member 81 is fixed to the pressing member 73 by, for example, bolts (not shown). The pressing screw 76 is held in a state of abutting against the second clamping member 82 of the spring unit 80.

[0030] A handle member 78 is provided on the head 76b of the pressing screw 76. By rotating the handle member 78, the pressing screw 76 is rotated in the tightening direction and the loosening direction. In the present embodiment, the handle member 78 rotates between a predetermined clamp position and an unclamp position. That is, when the handle member 78 is in the unclamp position, the pressing screw 76 does not apply a pressing force greater than the compression force f0 to the second clamping member 82. Also, when the handle member 78 is in the clamp position, the pressing screw 76 is screwed in more than in the unclamp position, and the pressing screw 76 applies a pressing force equal to or greater than the compression force f0 to the second clamping member 82. That is, the pressing screw 76 elastically compresses the elastic member 83 to narrow the distance between the second clamping member 82 and the first clamping member 81, and compresses and displaces the spring unit 80. In the present embodiment, the clamp position and the unclamp position are set so that the handle member 78 can move with a rotation of less than one revolution. That is, it is configured to be switchable between the unclamp position and the clamp position with a compression displacement δ of less than one pitch of the pressing screw 76. Therefore, for example, when the handle member 78 is rotated 180 degrees with respect to the unclamp position, it is configured to be in the clamp position.

[0031] As shown in FIG. 1, a control device 100 for controlling each part of the material testing machine 1 is juxtaposed with the material testing machine 1. The control device 100 is a device that centrally controls the material testing machine 1 and is connected so as to be able to transmit and receive signals to and from the material testing machine 1. The signals received by the control device 100 from the material testing machine 1 are measurement signals output by the displacement sensor 33 and the load cell 34, and appropriate signals required for control and testing. The signals transmitted by the control device 100 to the material testing machine 1 are control signals for the electromagnetic actuator 30 and appropriate signals required for other control and testing.

[0032] The control device 100 includes a computer, which comprises a processor such as a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit), a memory device such as a ROM (Read Only Memory) or a RAM (Random Access Memory), a storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and an interface circuit for connecting the control device 100 and various peripheral devices. Then, by the processor executing a computer program stored in the memory device or the storage device, various functions of the material testing machine 1 are realized.

[0033] Next, the operation of this embodiment will be described. The crosshead 14 is moved up and down according to the test content and the size of the test piece TP. With the handle member 78 held at the unclamped position, by operating the lifting handle 15, the crosshead 14 moves up and down. When the crosshead 14 is moved to a desired position, the left and right handle members 78 are moved from the unclamped position to the clamped position. As a result, the crosshead 14 is fixed to the support column 12, and the crosshead 14 does not move during the test. When the test is completed and the crosshead 14 needs to be moved, the handle member 78 is moved from the clamped position to the unclamped position. Thereby, the clamping by the clamping mechanism 70 is released, and the crosshead 14 can move up and down.

[0034] Here, when the handle member 78 is rotated from the unclamped position to the clamped position, the pressing screw 76 is tightened while the tip of the shaft portion 76a of the pressing screw 76 is in contact with the second clamping member 82 of the spring unit 80. At this time, since the compression force f0 is set on the elastic member 83 of the spring unit 80, the spring unit 80 will not be compressed and displaced, and the handle member 78 will not rotate unless the handle member 78 is rotated with a predetermined torque or more. Conversely, when the handle member 78 is rotated with a sufficient torque or more, the pressing screw 76 is screwed into the screw holder 74. The fact that the pressing screw 76 is screwed in means that the spring unit 80 has been elastically displaced, and it means that a pressing force equal to or greater than the applied compression force f0 has acted. Therefore, by moving the handle member 78 to the clamped position, the pressing force required for clamping can be accurately reproduced with high precision. Thereby, the clamping portion 71 of the clamping mechanism 70 clamps the column 12.

[0035] In particular, in the present embodiment, the handle member 78 is configured to be able to switch between the clamped position and the unclamped position within less than one rotation. Therefore, it is possible to distinguish between clamping and unclamping based on the rotational position of the handle member 78. In addition, since it is easy to apply torque to the pressing screw 76 by the handle member 78 and it is possible to distinguish between clamping and unclamping based on the rotational position of the handle member 78, tools such as a dedicated torque wrench are not required.

[0036] [2. Modification Example] The above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

[0037] In the above-described embodiments, the pressing member 73 has been described as a separate component separated from the crosshead body 14a, but the present invention is not limited to this. For example, it may be provided integrally with the crosshead body 14a. That is, the present embodiment may be applied to a configuration that clamps a slotted groove. Specifically, the crosshead 14 is formed with a fitting hole into which the column 12 is fitted, and a slit-shaped slotted groove extending radially outward from the fitting hole in the radial direction of the fitting hole, and a spring unit 80 is provided so as to apply a clamping force to the slotted groove, and a pressing screw 76 for pressing the spring unit 80 may be supported by the crosshead 14.

[0038] In the above-described embodiments, the configuration in which the crosshead 14 is provided with the clamping mechanism 70 has been described. However, for example, in a material testing machine in which the table 11 that supports the test piece TP moves relative to the column 12, the clamping mechanism 70 may be provided on the table 11.

[0039] In the above-described embodiments, the electromagnetic actuator 30 has been exemplified as the actuator, and the crosshead 14 has been exemplified as the support member. However, as the actuator, for example, an actuator that applies a load to the test piece TP by raising and lowering the crosshead may also be used, and as the support member, a crosshead that supports the test piece TP via a gripper may also be used.

[0040] In the above embodiment, the configuration in which the spring unit 80 has the first clamping member 81 has been described, but the first clamping member 81 may be omitted. That is, for example, a configuration in which a retaining bolt 85 is fastened to the pressing member 73 and a compressive force f0 is applied to the elastic member 83 by the pressing member 73 and the second clamping member 82 may also be used.

[0041] In the above-described embodiments, the configuration of the disc spring 84 has been described as the elastic member 83, but the elastic member 83 may be a compression spring or a leaf spring.

[0042] In the above-described embodiments, there is only one holder portion 81a, but there may be a plurality of them.

[0043] In the above-described embodiment, the clamping mechanism 70 has been described as clamping in the left-right direction SD. However, as long as the column 12 can be clamped, for example, in the front-rear direction TD, the direction is not limited.

[0044] In the above-described embodiment, a columnar shaft member has been exemplified. However, as long as sliding and rotation are possible, the shape is not limited to a columnar shape, and for example, a polygonal columnar shaft member may be used.

[0045] As in the above-described embodiment, since it is difficult for the non-hydraulic material testing machine 1 to adopt a hydraulic clamping method, the clamping mechanism 70 using the pressing screw 76 is particularly likely to be useful, but it may also be applied to a material testing machine that uses hydraulic pressure.

[0046] In the above-described embodiment, the column 12 has been exemplified as the shaft member, but a shaft member for rotation may also be used. Therefore, for example, it may be applied to a configuration that clamps the trunnion shaft of a vibration device as a material testing machine.

[0047] [3. Aspect] It is understood by those skilled in the art that the above-described exemplary embodiments and modification examples are specific examples of the following aspects.

[0048] (Item 1) A material testing machine according to one aspect includes an actuator that applies a load to a test piece, a support member that supports the actuator or the test piece and is supported by a shaft member, and a clamping mechanism that clamps the support member to the shaft member. The clamping mechanism may include an elastic member unit having an elastic member that has been elastically deformed in advance with a predetermined compressive force, and the support member may be clamped to the shaft member by pressing the elastic member unit with a pressing screw.

[0049] According to the material testing machine described in claim 1, the elastic member is pre-elastic deformed. If the pressing screw can be rotated, it can be clamped by a pressing force equal to or greater than a predetermined compressive force through the elastic member unit. Therefore, conventionally, the pressing force was generated from the torque due to the rotation of the screw and the pressing force varied. However, in the material testing machine described in claim 1, the rotation of the pressing screw is converted into the movement of the tip, and the movement of the tip is converted into the elastic force which is the pressing force. Therefore, the pressing force required for clamping can be accurately reproduced. Also, in material testing, reproducibility is often required. On the other hand, the fixing of the shaft member that affects the test is not sensed, which may lead to variations in test results that are not visible to the eye. With the material testing machine described in claim 1, it becomes possible to provide test results with high reproducibility.

[0050] (Claim 2) In the material testing machine described in claim 1, the elastic member unit includes a clamping member that supports the elastic member with the elastic member sandwiched therebetween, and the pressing screw may press the clamping member.

[0051] According to the material testing machine described in claim 2, the elastic member can be pre-elastic deformed with a predetermined compressive force with a simple configuration.

[0052] (Claim 3) In the material testing machine described in claim 2, the clamping mechanism includes a pressing member that clamps the shaft member, and the pressing screw may clamp the support member to the shaft member by pressing the pressing member through the elastic member unit.

[0053] According to the material testing machine described in claim 3, it is possible to easily arrange the elastic member unit in the clamping mechanism.

[0054] (Claim 4) In the material testing machine according to claim 3, a columnar guide rod extending from the support member and a screw support member fixed to the guide rod are provided, the pressing member is slidably supported by the guide rod between the shaft member and the screw support member, and the pressing screw may be supported by the screw support member so as to be capable of pressing the elastic member unit.

[0055] According to the material testing machine of claim 4, it is possible to easily press while stabilizing the movement of the pressing member, and since the position of the pressing screw is determined, the elastic displacement of the elastic member unit can be accurately controlled based on the rotation amount of the pressing screw.

[0056] (Claim 5) In the material testing machine according to any one of claims 1 to 4, a handle member for operating the pressing screw is provided, and the handle member may be formed so as to be operable between a clamp position and an unclamp position by a rotation operation of less than one rotation.

[0057] According to the material testing machine of claim 5, it is possible to distinguish between clamping and unclamping based on the rotational position of the handle member. Further, the pressing screw can be tightened without using a dedicated tool such as a torque wrench.

Description of Reference Numerals

[0058] 1 Material testing machine 12 Support column (shaft member) 14 Crosshead (support member) 30 Electromagnetic actuator (actuator) 70 Clamping mechanism 72 Guide rod 73 Pressing member 74 Screw holder (screw support member) 76 Pressing screw 78 Handle member 80 Spring unit (elastic member unit) 82 Second clamping member (clamping member) TP Test piece

Claims

1. An actuator for applying a load to a test piece, a support member that supports the actuator or the test piece and is supported by a shaft member, and a clamping mechanism that clamps the support member to the shaft member. The clamping mechanism includes an elastic member unit having an elastic member that is elastically deformed in advance with a predetermined compressive force, and clamps the support member to the shaft member by pressing the elastic member unit with a pressing screw. A material testing machine.

2. The elastic member unit includes a clamping member that sandwiches and supports the elastic member, and the pressing screw presses the clamping member. The material testing machine according to Claim 1.

3. The clamping mechanism includes a pressing member that clamps the shaft member, and the pressing screw clamps the support member to the shaft member by pressing the pressing member via the elastic member unit. The material testing machine according to Claim 2.

4. A columnar guide rod extending from the support member, and a screw support member fixed to the guide rod. The pressing member is slidably supported by the guide rod between the shaft member and the screw support member. The screw support member supports the pressing screw so as to be able to press the elastic member unit. The material testing machine according to Claim 3.

5. A handle member for operating the pressing screw. The handle member is formed so as to be operable between a clamped position and an unclamped position by a rotation operation of less than one rotation. The material testing machine according to Claim 1.

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