JP2011149788A - Shaft-center adjustment device of material testing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft-center adjustment device of a material testing machine for performing shaft-center adjustment in a quick and correct way. <P>SOLUTION: The shaft-center adjustment device includes: a connecting shaft 31 for connecting a crosshead 23 and an upper gripper 11; a frame member 39 having a support portion 37, which is fixed to the connecting shaft 31 and a frame portion 36, which surrounds the connecting shaft 31; a collar member 35 for position adjustment which is fixed to the upper gripper 11; a first screw member 51, which screws together with a first screw hole formed in the collar member 35 for position adjustment; a pair of first guide members which are movably journalled to both ends of the first screw member 51, in a direction perpendicular to the shaft center of the first screw member 51; a second screw member which is journalled to a second screw hole formed in the collar member 35 for position adjustment, in a direction perpendicular to the first screw hole; and a pair of second guidance members which are movably journalled to both ends of the second screw member, in a direction perpendicular to the shaft center of the second screw member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an axis adjusting device for a material testing machine for adjusting the axis of a gripping tool that holds a test piece.

  Such a material testing machine measures the test force and displacement at that time with a load cell and a displacement detector while applying a load to the test piece gripped at both ends by the upper gripper and the lower gripper. The test force-displacement characteristic of the test piece and the SN diagram are obtained. In such a material testing machine, an accurate material test cannot be executed unless the axes of the upper gripper and the lower gripper are aligned. For this reason, in such a material testing machine, an axis adjusting device for adjusting the axis of the upper gripping tool and the lower gripping tool is provided.

  FIG. 7 is a schematic view of such a conventional shaft center adjusting device 113.

  The shaft center adjusting device 113 is interposed between the cross head 23 and the upper gripper 11, and includes a connecting shaft 131 that connects the crosshead 23 and the upper gripper 11, and a center of the connecting shaft 131. A frame member 139 fixed to the section, an angle adjusting collar member 134 disposed on the outer periphery of the connecting shaft 131 inside the frame member 139 and fixed to the crosshead 23, and a connecting shaft inside the frame member 139. A position adjusting collar member 135 disposed on the outer periphery of 131 and fixed to the upper gripping tool 11;

  The connecting shaft 131 passes through the angle adjusting collar member 134, the frame member 139, and the position adjusting collar member 135, and the upper end portion of the connecting shaft 131 is screwed with the mounting plate 132. Is screwed to the upper grip 11. The mounting plate 132 is connected to the cross head 23 via a pair of jack bolts 133. Therefore, the upper gripper 11 can be fastened to the crosshead 23 with a predetermined force by moving the mounting plate 132 upward with respect to the crosshead 23 using a pair of jack bolts 133.

  The frame member 139 includes a support portion 137 that is screwed and fixed to the connecting shaft 131, and a rectangular frame portion 136 that surrounds the connecting shaft 131. A hemispherical convex portion 138 is formed on the upper surface of the support portion 137, and a hemispherical concave portion having a shape corresponding to the convex portion 138 is formed on the lower surface of the angle adjusting collar member 134. Further, the lower surface of the support portion 137 has a planar shape, and is in contact with the upper surface of the planar position adjusting collar member 135.

  FIG. 8 is a schematic plan view of the vicinity of the angle adjusting collar member 134 in the conventional shaft adjusting device 113.

  The angle adjusting collar member 134 has a rectangular shape in a plan view, and an outer peripheral surface thereof is a front end portion of four screws 141, 142, 143, and 144 that are screwed with the frame portion 136 of the frame member 139. Abut. For this reason, by adjusting the four screws 141, 142, 143, and 144, the frame member 139 can be inclined together with the connecting shaft 131 to adjust the angle of the upper gripper 11. That is, of the four screws 141, 142, 143, 144, one of the two screws facing each other is loosened and the other is tightened, and the hemispherical convex portion 138 of the frame member 139 is moved to the angle adjusting collar member. The frame member 139 can be tilted together with the connecting shaft 131 by being moved along the hemispherical concave portion 134. As the connecting shaft 131 is inclined, the upper gripper 11 is inclined.

  FIG. 9 is a schematic plan view of the vicinity of the position adjusting collar member 135 in the conventional shaft center adjusting device 113.

  The position adjusting collar member 135 has a rectangular shape in plan view, and an outer peripheral surface thereof is a tip portion of four screws 151, 152, 153, and 154 that are screwed into the frame portion 136 of the frame member 139. Abut. Therefore, by adjusting the four screws 151, 152, 153, and 154, the position of the upper gripper 11 can be adjusted by moving the frame member 139 together with the connecting shaft 131. That is, of the four screws 151, 152, 153, 154, the frame member 139 is moved along the upper surface of the position adjusting collar member 135 in a state where one of the two screws facing each other is loosened and the other screw is tightened. By doing so, the frame member 139 can be moved relative to the position adjusting collar member 135 together with the connecting shaft 131. Then, the upper gripper 11 moves with the relative movement of the connecting shaft 131.

  In this conventional shaft adjusting device 113, the hemispherical convex portion 138 is formed on the upper surface of the support portion 137 of the frame member 139, and the lower surface of the support portion 137 is planar, but the hemispherical convex portion 138 is formed. In consideration of the high manufacturing cost, a pair of collars in which concave portions made of cylindrical curved surfaces are formed on both upper and lower surfaces of the frame member 139 and convex portions made of cylindrical curved surfaces are formed on the upper and lower sides thereof. An axis adjusting device in which members are arranged has also been proposed (see Patent Document 1). Also in the shaft center adjusting device described in Patent Document 1, by adjusting the screws corresponding to the four screws 141, 142, 143, 144 and the four screws 151, 152, 153, 154 described above, The position and angle of the connecting shaft can be adjusted.

JP 2000-171366 A

  In the conventional shaft center adjusting device described above, when adjusting the four screws 151, 152, 153, 154 to adjust the position of the connecting shaft 131, the screws 151, 152, 153, 154 are used. When the action line of stress when pressing the connecting shaft 131 does not pass through the center of gravity of the position adjustment collar member 135, a moment acts on the position adjustment collar member 135, and the position adjustment collar member 135 rotates. . For this reason, for example, even if the X-direction screw 151 or 152 is rotated to move the upper gripper 11 in the X direction, an unintended movement in the Y direction occurs. For this reason, it takes time to adjust the axis, and there arises a problem that accurate axis adjustment cannot be performed.

  Further, in the conventional shaft center adjusting device described above, when any of the screws 151, 152, 153, 154 is rotated to adjust the position, the screws 151, 152, 153, 154 are opposed to each other. Since it is necessary to loosen the screw arranged at the position to be in advance, there is a problem that workability is poor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an axis adjusting device for a material testing machine capable of quickly and accurately executing the axis adjustment.

  The invention described in claim 1 is an axis adjusting device for a material testing machine for adjusting the axis of a gripping tool for gripping a test piece, the first member on the side of the apparatus main body, and the first member on the side of the gripping tool. A frame member having a connecting shaft for connecting two members, a support portion fixed to the connecting shaft, and a frame portion surrounding the connecting shaft, and inside the frame portion of the frame member, and the connecting shaft A position adjusting collar member fixed to one of the first member and the second member, and a first screw hole formed in the position adjusting collar member. A pair of first screw members that are screwed together and a pair that is disposed on the frame portion and pivotally supports both end portions of the first screw member in a state in which the first screw member can move only in a direction orthogonal to the axis of the first screw member. The first guide member and the position adjusting collar member perpendicular to the first screw hole A second screw member that is screwed into the formed second screw hole and the frame portion, and both ends of the second screw member are only in a direction perpendicular to the axis of the second screw member. And a pair of second guide members that are pivotally supported in a movable state.

  According to a second aspect of the present invention, in the first aspect of the present invention, the first biasing means for biasing the position adjusting collar member toward the axial direction of the first screw member, and the position adjustment. And a second urging means for urging the collar member toward the axial direction of the second screw member.

  According to a third aspect of the present invention, in the second aspect of the present invention, the first urging means is configured such that the first urging member has an outer periphery at a position between the position adjusting collar member and the frame portion. A first coil spring disposed in a portion, wherein the second urging means is disposed on an outer peripheral portion of the second screw member at a position between the position adjusting collar member and the frame portion. A second coil spring.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the position adjustment is arranged in parallel to the first screw member at a position opposite to the first screw member with respect to the connecting shaft. A first guide shaft for guiding the collar member in the axial direction of the first screw member, and a parallel to the second screw member at a position opposite to the second screw member with respect to the connecting shaft. And a second guide shaft for guiding the position adjusting collar member in the axial direction of the second screw member.

  According to a fifth aspect of the present invention, in the third aspect of the invention, a hemispherical convex portion is formed on a surface of the support portion of the frame member opposite to the position adjusting collar member. The support member is disposed at a position opposite to the position adjusting collar member, and has a hemispherical concave portion corresponding to the hemispherical convex portion, and the first member or the second member. An angle adjusting collar member fixed to a side on which the position adjusting collar member is not fixed, and a plurality of screws for changing a relative position of the angle adjusting collar member with respect to the frame portion. Is further provided.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the first member is a crosshead, and the second member is a gripping tool.

  According to the first aspect of the present invention, the workability and accuracy of the shaft center adjustment are improved by moving the position adjusting collar member in directions orthogonal to each other by the action of the first screw member and the second screw member. Can be made. For this reason, it is possible to execute the axis adjustment quickly and accurately.

  According to the second aspect of the present invention, the movement of the position adjusting collar member can be restricted in a state where the first screw member or the second screw member is not rotated, and the position adjusting collar member is fixed at the position. It becomes possible to do.

  According to the third aspect of the present invention, the position adjusting collar member can be reliably secured by the action of the first and second coil springs disposed on the outer peripheral portions of the first and second screw members, although the configuration is simple. It can be fixed.

  According to the fourth aspect of the invention, the position adjusting collar member can be guided more smoothly by the action of the first and second guide shafts.

  According to the fifth aspect of the present invention, it is possible to adjust the axial position of the second member more appropriately by adjusting the angular position of the second member by the action of the angle adjusting collar member.

  According to the sixth aspect of the present invention, the position adjustment of the upper gripper with respect to the cross head can be performed quickly and accurately.

It is a schematic diagram of a material testing machine to which the shaft center adjusting device according to the present invention is applied. It is a schematic diagram of the axial center adjustment apparatus 13 which concerns on this invention. It is a plane schematic diagram of the vicinity of the angle adjusting collar member 34 in the shaft center adjusting device 13 according to the present invention. FIG. 6 is a schematic plan view of the vicinity of the position adjusting collar member 35 in the shaft center adjusting device 13 according to the present invention. It is a front view which shows the test piece 10a for a test for axial center adjustment. It is a plane schematic diagram of the vicinity of the position adjusting collar member 35 in the shaft center adjusting device according to the second embodiment of the present invention. It is a schematic diagram of the conventional axial center adjustment apparatus 113. FIG. 10 is a schematic plan view of the vicinity of an angle adjusting collar member in a conventional shaft adjusting device. FIG. 10 is a schematic plan view of the vicinity of a position adjusting collar member 135 in a conventional shaft adjusting device 113.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a material testing machine that uses the shaft center adjusting device according to the present invention will be described. FIG. 1 is a schematic diagram of a material testing machine to which an axis adjusting device according to the present invention is applied.

  The material testing machine includes a base 16, a pair of left and right screw rods 17 erected on the base 16, and a nut portion screwed with the pair of left and right screw rods 17. And a cross head 23 that moves up and down. The upper grip 11 is attached to the cross head 23 via the shaft center adjusting device 13 according to the present invention. In addition, the lower grip 12 is attached to the base 16 via a load cell 15. The both ends of the test piece 10 are gripped by the upper grip 11 and the lower grip 12.

  Synchronous pulleys 21 that engage with the synchronous belt 22 are disposed at the lower ends of the pair of screw rods 17, respectively. The synchronous belt 22 is also engaged with a synchronous pulley 19 that is rotated by driving of the motor 18. For this reason, the pair of screw rods 17 rotate in synchronization with the drive of the motor 18. Then, as the pair of screw rods 17 rotate in synchronization, the cross head 23 moves up and down in the axial direction of the pair of screw rods 17.

  The test force applied to the test piece 10 is detected by the load cell 15. Further, the displacement amount between the upper and lower gauge points of the test piece 10 is detected by the displacement meter 14. Signals from the load cell 15 and the displacement meter 14 are input to a control circuit (not shown). The control circuit creates a drive control signal for the motor 18 based on signals from the load cell 15 and the displacement meter 14. Thereby, the rotation of the motor 18 is controlled, and various material tests such as tension and compression are performed.

  Next, the configuration of the shaft center adjusting device according to the present invention will be described. FIG. 2 is a schematic diagram of the shaft center adjusting device 13 according to the present invention.

  The shaft adjusting device 13 is interposed between the cross head 23 and the upper gripper 11 and connects the crosshead 23 and the upper gripper 11 in the same manner as the conventional shaft center adjusting device 113 described above. A connecting shaft 31 to be connected, a frame member 39 fixed to the central portion of the connecting shaft 31, and an angle adjusting collar disposed on the outer periphery of the connecting shaft 31 inside the frame member 39 and fixed to the crosshead 23. A member 34 and a position adjusting collar member 35 disposed on the outer periphery of the connecting shaft 31 inside the frame member 39 and fixed to the upper gripper 11 are provided.

  The connecting shaft 31 penetrates the angle adjusting collar member 34, the frame member 39 and the position adjusting collar member 35, and the upper end portion of the connecting shaft 31 is screwed with the mounting plate 32. Is screwed to the upper grip 11. The mounting plate 32 is connected to the cross head 23 via a pair of jack bolts 33. For this reason, the upper gripper 11 can be fastened to the crosshead 23 with a predetermined force by moving the attachment plate 32 upward with respect to the crosshead 23 using the pair of jack bolts 33.

  The frame member 39 includes a support portion 37 that is screwed and fixed to the connecting shaft 31, and a rectangular frame portion 36 that surrounds the periphery of the connecting shaft 31. A hemispherical convex portion 38 is formed on the upper surface of the support portion 37, and a hemispherical concave portion having a shape corresponding to the convex portion 38 is formed on the lower surface of the angle adjusting collar member 34. Further, the lower surface of the support portion 37 has a planar shape and is in contact with the upper surface of the planar position adjusting collar member 35.

  FIG. 3 is a schematic plan view of the vicinity of the angle adjusting collar member 34 in the shaft center adjusting device 13 according to the present invention.

  The angle adjusting collar member 34 has a rectangular shape in plan view, and an outer peripheral surface thereof is a tip portion of four screws 41, 42, 43, 44 that are screwed into the frame portion 36 of the frame member 39. Abut. Therefore, by adjusting the four screws 41, 42, 43, 44, it is possible to adjust the angle of the upper gripper 11 by inclining the frame member 39 together with the connecting shaft 31. That is, of the four screws 41, 42, 43, 44, one of the two screws facing each other is loosened and one of the screws is tightened, and the hemispherical convex portion 38 of the frame member 39 is angle-adjusted collar member. The frame member 39 can be inclined together with the connecting shaft 31 by moving along the 34 hemispherical recesses. As the connecting shaft 31 is inclined, the upper gripper 11 is inclined.

  FIG. 4 is a schematic plan view of the vicinity of the position adjusting collar member 35 in the shaft center adjusting device 13 according to the present invention.

  The position adjusting collar member 35 has a rectangular shape in plan view, and is disposed inside the frame portion 36 of the frame member 39 and on the outer peripheral portion of the connecting shaft 31 as described above. It is fixed to the gripping tool 11.

  The position adjusting collar member 35 is formed with a first screw hole, and the first screw member 51 is screwed into the first screw hole. Both ends of the first screw member 51 are rotatably supported by a pair of bearings 53. The pair of bearings 53 are a pair of first bearings movable along the recess 57 in a recess 57 formed in the frame portion 36 of the frame member 39 in a direction perpendicular to the axis of the first screw member 51. It is supported by the guide member 54. For this reason, both ends of the first screw member 51 are pivotally supported in a state in which they can move only in a direction orthogonal to the axis of the first screw member 51.

  Further, the position adjusting collar member 35 is formed with a second screw hole that faces in a direction orthogonal to the first screw hole, and the second screw member 52 is screwed into the second screw hole. Match. Both ends of the second screw member 52 are rotatably supported by a pair of bearings 55. The pair of bearings 55 are formed in the recess portion 58 formed in the frame portion 36 of the frame member 39 in a direction orthogonal to the axis of the second screw member 52 (in the axis direction of the first screw member 51). It is supported by a pair of second guide members 56 that can move along 58. For this reason, both ends of the second screw member 52 are pivotally supported in a state in which they can move only in a direction orthogonal to the axis of the second screw member 52.

  On the outer periphery of the first screw member 51 at a position between the position adjustment collar member 35 and the frame portion 36 of the frame member 39, the first position adjustment collar member 35 is directed toward the direction away from the frame portion 36. A first coil spring 71 is disposed to urge the screw member 51 in the axial direction. In addition, the position adjusting collar member 35 is directed toward the direction away from the frame portion 36 on the outer peripheral portion of the second screw member 52 at a position between the position adjusting collar member 35 and the frame portion 36 of the frame member 39. A second coil spring 72 that biases in the axial direction of the second screw member 52 is disposed.

  In the shaft center adjustment device 13 having such a configuration, the frame member 39 is moved along the upper surface of the position adjustment collar member 35 with respect to the position adjustment collar member 35 by adjusting the first screw member 51. The frame member 39 can be moved relative to the position adjustment collar member 35 along the upper surface of the position adjustment collar member 35 by adjusting the second screw member 52. It can be moved relatively in the Y direction. Therefore, by adjusting the first screw member 51 and the second screw member 52, the frame member 39 is moved in the X and Y directions along the upper surface of the position adjusting collar member 35, thereby connecting the frame member 39. Together with the shaft 31, it can be moved relative to the position adjusting collar member 35 in the X and Y directions. Then, as the connecting shaft 31 moves in the X and Y directions, the upper gripper 11 moves in the X and Y directions.

  In a state where the first screw member 51 and the second screw member 52 are not rotated, the position adjusting collar member 35 of the first screw member 51 and the second screw member 52 is caused by the action of the first and second coil springs 71 and 72. Since it is biased in the axial direction, the movement of the position adjusting collar member 35 can be restricted, and the position adjusting collar member 35 can be fixed at that position.

  As described above, in the shaft center adjusting device 13 according to the present invention, the frame member 39 is moved to the position adjusting collar member 35 together with the connecting shaft 31 by adjusting the first screw member 51 and the second screw member 52. On the other hand, it can be relatively moved in the X and Y directions, and the axis adjustment in the X and Y directions can be easily executed. At this time, unlike the conventional case, there is no unintentional movement in the Y direction when adjusting the axis in the X direction, and it is not necessary to loosen the screws facing each other in advance. The accuracy and accuracy can be improved, and the shaft center adjustment can be performed quickly and accurately.

  FIG. 5 is a front view showing a test specimen 10a for adjusting the axis.

  When the axis adjustment is performed by using the axis adjustment device 13 as described above, as shown in FIG. 5, evaluation is performed using a test specimen 10a for testing in which a plurality of strain gauges 69 are provided on the side surface. Perform the test. That is, both ends of the test specimen 10a for testing are gripped by the upper gripping tool 11 and the lower gripping tool 12, and the shaft center adjusting device 13 is adjusted so that the strain of the strain gauge 69 is zero when a tensile load is applied. In this case, for example, the adjustment angle is adjusted to 0.1 degrees or less, and the shift amount in the X direction and the Y direction is adjusted to 1 mm or less. Such an axis adjustment is performed when the material testing machine is shipped or when the upper gripper 11 or the lower gripper 12 is replaced.

  Next, another embodiment of the present invention will be described. FIG. 6 is a schematic plan view of the vicinity of the position adjusting collar member 35 in the shaft center adjusting device according to the second embodiment of the present invention. In addition, about the member similar to the axial center adjustment apparatus 13 which concerns on 1st Embodiment mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The shaft center adjusting device according to the second embodiment is configured by adding a first guide shaft 61 and a second guide shaft 62 to the shaft center adjusting device 13 according to the first embodiment described above, thereby providing a first screw. Even when the member 51 and the second screw member 52 are not located at the center of the position adjusting collar member 35, the shaft center adjustment can be executed more smoothly.

  The shaft center adjusting device according to the second embodiment is arranged in parallel to the first screw member 51 at a position opposite to the first screw member 51 with respect to the connecting shaft 31, and the position adjusting collar member 35 is provided. A first guide shaft 61 that guides in the axial direction of the first screw member 61, and is disposed in parallel to the second screw member 52 at a position opposite to the second screw member 52 with respect to the connecting shaft 31, And a second guide shaft 62 for guiding the position adjusting collar member 35 in the axial direction of the second screw member 52.

  The first guide shaft 61 is pivotally supported by a bearing 63 disposed on the position adjusting collar member 35. A pair of both ends of the first guide shaft 61 is movable along the recess 67 in a recess 67 formed in the frame 36 of the frame member 39 in a direction perpendicular to the axis of the first screw member 51. The guide member 64 is supported. For this reason, both ends of the first guide shaft 61 are pivotally supported in a state in which they can move only in a direction orthogonal to the axis of the first screw member 51.

  Similarly, the second guide shaft 62 is pivotally supported by a bearing 65 disposed on the position adjusting collar member 35. A pair of both ends of the second guide shaft 62 is movable along the recess 68 in a recess 68 formed in the frame 36 of the frame member 39 in a direction perpendicular to the axis of the second screw member 52. The guide member 66 is supported. For this reason, both ends of the second guide shaft 62 are pivotally supported in a state in which they can move only in a direction orthogonal to the axis of the second screw member 52.

  In the shaft center adjusting device having such a configuration, the position adjusting collar member 35 is guided by the first and second screw members 51 and 52 and the first and second guide shafts 61 and 62. Therefore, the position adjusting collar member 35 can be guided more smoothly, and the axis adjustment can be performed more easily.

  Even when the first screw member 51 and the second screw member 52 are not at the center of the position adjusting collar member 35, the above-described first and second guide shafts 61, 61, Instead of using 62, through-holes for the first and second screw members 51 and 52 are formed in the connecting shaft 31, and the first and second screw members 51 and 52 are arranged at positions passing through the through-holes. You may make it do.

  In the above-described embodiment, the shaft center adjusting device according to the present invention is disposed between the cross head 23 as the first member on the apparatus main body side and the upper gripper 11 as the second member on the gripper side. However, this axis adjusting device may be disposed at other places such as between the lower gripping tool 12 and the load cell 15. In short, this axis adjusting device may be disposed between any member on the apparatus main body side and any member on the upper gripper 11 or lower gripper 12 side.

DESCRIPTION OF SYMBOLS 10 Test piece 10a Test specimen 11 Upper grip 12 Lower grip 13 Axle adjuster 14 Displacement meter 15 Load cell 17 Screw rod 18 Motor 23 Cross head 31 Connecting shaft 32 Mounting plate 33 Jack bolt 34 Angle adjustment collar member 35 Position adjusting collar member 36 Frame portion 37 Support portion 38 Convex portion 39 Frame member 41 Screw 42 Screw 43 Screw 44 Screw 51 First screw member 52 Second screw member 53 Bearing 54 First guide member 55 Bearing 56 Second guide member 57 Recess 58 Recess 61 First guide shaft 62 Second guide shaft 69 Strain gauge 71 First coil spring 72 Second coil spring

Claims (6)

An axis adjusting device for a material testing machine for adjusting the axis of a gripping tool for gripping a test piece,
A connecting shaft for connecting the first member on the apparatus main body side and the second member on the gripper side;
A frame member having a support portion fixed to the connection shaft and a frame portion surrounding the connection shaft;
A position adjusting collar member disposed inside the frame portion of the frame member and disposed on the outer peripheral portion of the connecting shaft, and fixed to either the first member or the second member;
A first screw member screwed into a first screw hole formed in the position adjusting collar member;
A pair of first guide members disposed on the frame portion and pivotally supported in a state in which both end portions of the first screw member are movable only in a direction orthogonal to the axis of the first screw member;
A second screw member screwed into a second screw hole formed in a direction orthogonal to the first screw hole in the position adjusting collar member;
A pair of second guide members disposed on the frame portion and pivotally supported in a state in which both end portions of the second screw member are movable only in a direction orthogonal to the axis of the second screw member;
An apparatus for adjusting the axis of a material testing machine. In the axis adjusting device of the material testing machine according to claim 1,
First biasing means for biasing the position adjusting collar member toward the axial direction of the first screw member;
Second urging means for urging the position adjusting collar member toward the axial direction of the second screw member;
A shaft tester for a material testing machine, further comprising: In the axis adjusting device of the material testing machine according to claim 2,
The first urging means is a first coil spring disposed on the outer peripheral portion of the first screw member at a position between the position adjusting collar member and the frame portion,
The second urging means is a second coil spring disposed on an outer peripheral portion of the second screw member at a position between the position adjusting collar member and the frame portion. Adjustment device. In the axis adjusting device of the material testing machine according to claim 3,
A first guide member that is disposed in parallel to the first screw member at a position opposite to the first screw member with respect to the connecting shaft and guides the position adjusting collar member in the axial direction of the first screw member. A guide shaft;
A second guide member is disposed in parallel to the second screw member at a position opposite to the second screw member with respect to the connecting shaft, and guides the position adjusting collar member in the axial direction of the second screw member. A guide shaft;
A shaft tester for a material testing machine, further comprising: In the axis adjusting device of the material testing machine according to claim 3,
A hemispherical convex portion is formed on the surface of the support portion of the frame member opposite to the position adjusting collar member, and
A hemispherical concave portion corresponding to the hemispherical convex portion is formed at a position opposite to the position adjusting collar member in the support portion, and the first member or the second member Among them, the angle adjusting collar member fixed to the side where the position adjusting collar member is not fixed,
A plurality of screws for changing a relative position of the angle adjusting collar member with respect to the frame portion;
A shaft tester for a material testing machine, further comprising: In the shaft center adjusting device of the material testing machine according to any one of claims 1 to 5,
The shaft adjusting device of the material testing machine, wherein the first member is a cross head and the second member is a gripper.

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