Parallel linear guide

Abstract

This parallel linear guide comprises: first and second linear guide rails that extend linearly in a first direction and are disposed parallel to each other in a second direction orthogonal to the first direction; first and second guide blocks that are respectively attached to the first and second linear guide rails and are movable along the linear guide rails; and first and second bases that are respectively fixed to the first and second guide blocks. The parallel linear guide further comprises: first and second elastic members that are respectively sandwiched between the upper surface of the first base and the lower surface of an object to be supported, and between the upper surface of the second base and the lower surface of the object to be supported; and a plate-shaped flexible member positioned between the first and second linear guide rails, and allowing vertical variation of the first base.

Description

Parallel Linear Guide

[0001] The present invention relates to a parallel linear guide.

[0002] Japanese Utility Model Publication No. 1990030565 discloses a feed mechanism having parallel guide rails.

[0003] In the mechanism disclosed in the above publication, distortion is concentrated in areas where the parallelism of the guide rails is low, which increases the resistance to movement between the guide block and the guide rail, hindering the smooth movement of the supported object.

[0004] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a parallel linear guide equipped with a feed mechanism having parallel guide rails, which allows a supported object to move more smoothly along the guide rails.

[0005] One aspect of the present invention is a parallel linear guide capable of moving a supported object in a predetermined direction while supporting it from below. The parallel linear guide includes first and second linear guide rails extending linearly in a first direction and arranged parallel to each other in a second direction perpendicular to the first direction; first and second guide blocks attached to the first and second linear guide rails, respectively, and movable along the linear guide rails; and first and second bases fixed to the upper surfaces of the first and second guide blocks, respectively. The parallel linear guide further includes first and second elastic members sandwiched between the upper surface of the first base and the lower surface of the supported object, and between the upper surface of the second base and the lower surface of the supported object, and a plate-shaped flexible member positioned between the parallel-arranged first and second linear guide rails and allowing the first base to move in the up-down direction. The end of the flexible member facing the first base in the second direction is fixed to the end of the first base, and the end of the flexible member facing the second base in the second direction is fixed to the lower surface of the supported object.

[0006] Fig. 1 is a plan view illustrating a parallel linear guide according to an embodiment of the present invention, Fig. 2 is a front view illustrating the parallel linear guide, and Fig. 3 is a side view illustrating the parallel linear guide.

[0007] [Configuration of Parallel Linear Guide] The parallel linear guide 1 according to the embodiment of the present invention will be described in detail with reference to the drawings.

[0008] Fig. 1 is a plan view illustrating a parallel linear guide 1 according to an embodiment of the present invention. Fig. 2 is a front view illustrating the parallel linear guide 1. Fig. 3 is a side view illustrating the parallel linear guide 1. In Fig. 1, part of the configuration is indicated by a two-dot chain line to make the explanation easier to understand.

[0009] The parallel linear guide 1 shown in Figure 1 can be installed in a building, for example, and can function as a vibration control device that reduces vibrations caused in the building by wind or earthquakes by moving the supported body 100 in a predetermined direction along the parallel linear guides.

[0010] In this embodiment, the supported object 100 is a plate. The supported object 100, which is a plate, may itself be a weight having a predetermined weight, or a heavy object that functions as a weight may be placed on the supported object 100.

[0011] 1 and 2, the parallel linear guide 1 includes a first linear guide rail 10 and a second linear guide rail 20. The first linear guide rail 10 and the second linear guide rail 20 each extend linearly in a first direction. The first linear guide rail 10 and the second linear guide rail 20 are arranged parallel to each other in a second direction perpendicular to the first direction. In other words, the parallel linear guide 1 includes the first linear guide rail 10 and the second linear guide rail 20 in parallel.

[0012] 1 and 2 corresponds to the first direction. The Y direction is referred to as the movement direction of the parallel linear guide 1. The X direction, which is perpendicular to the Y direction, corresponds to the second direction. The X direction is referred to as the width direction of the parallel linear guide 1. The Z direction is referred to as the height direction (or up-down direction) of the parallel linear guide 1.

[0013] 1, the first linear guide rail 10 extends in the Y direction and includes two guide rails 11 and 12 arranged parallel to the X direction. The second linear guide rail 20 extends in the Y direction and includes two guide rails 21 and 22 arranged parallel to the X direction.

[0014] The guide rails 11 and 12 are fixed to a part of a building while being kept parallel at a predetermined distance by a rail base 13. The guide rails 21 and 22 are fixed to a part of a building while being kept parallel at a predetermined distance by a rail base 23. The rail bases 13 and 23 also keep the first linear guide rail 10 and the second linear guide rail 20 parallel.

[0015] The parallel linear guide 1 includes a first guide block 30 and a second guide block 40. The first guide block 30 is attached to a first linear guide rail 10 and is movable along the first linear guide rail 10. The second guide block 40 is attached to a second linear guide rail 20 and is movable along the second linear guide rail 20.

[0016] 1 and 2, the first guide block 30 is composed of four guide blocks 31, 32, 33, and 34. The guide blocks 31 and 33 are arranged parallel to each other in the extension direction (Y direction) on the guide rail 11 that constitutes the first linear guide rail 10. The guide blocks 32 and 34 are arranged parallel to each other in the extension direction (Y direction) on the guide rail 12 that constitutes the first linear guide rail 10. Furthermore, the guide block 31 on the guide rail 11 and the guide block 32 on the guide rail 12 are arranged parallel to each other in the width direction, and the guide block 33 on the guide rail 11 and the guide block 34 on the guide rail 12 are arranged parallel to each other in the width direction.

[0017] The second guide block 40 is composed of four guide blocks 41, 42, 43, and 44. The guide blocks 41 and 43 are arranged parallel to each other in the extension direction (Y direction) on the guide rail 21 that constitutes the second linear guide rail 20. The guide blocks 42 and 44 are arranged parallel to each other in the extension direction (Y direction) on the guide rail 22 that constitutes the second linear guide rail 20. Furthermore, the guide block 41 on the guide rail 21 and the guide block 42 on the guide rail 22 are arranged parallel to each other in the width direction, and the guide block 43 on the guide rail 21 and the guide block 44 on the guide rail 22 are arranged parallel to each other in the width direction.

[0018] The parallel linear guide 1 includes a first base 50 and a second base 60. The first base 50 is fixed to the upper surfaces of the four guide blocks 31 to 34 that make up the first guide block 30. The second base 60 is fixed to the upper surfaces of the four guide blocks 41 to 44 that make up the second guide block 40.

[0019] 2 , the parallel linear guide 1 includes a first elastic member 70 and a second elastic member 80. The first elastic member 70 is sandwiched between the upper surface of the first base 50 and the lower surface of the supported object 100, and the second elastic member 80 is sandwiched between the upper surface of the second base 60 and the lower surface of the supported object 100.

[0020] The first elastic member 70 is a generally rectangular, flat-plate rubber member that abuts against the upper surface of the first base 50 and the lower surface of the supported object 100. The second elastic member 80 is also a flat-plate rubber member that abuts against the upper surface of the second base 60 and the lower surface of the supported object 100.

[0021] As long as the first elastic member 70 and the second elastic member 80 are configured to be in close contact with the first base 50 and the supported object 100, they do not need to be physically fastened (fixed) to the first base 50 and the supported object 100. The cushioning effect of the first elastic member 70 and the second elastic member 80 can be enhanced if the first elastic member 70 and the second elastic member 80 are not fastened to the first base 50 or the supported object 100. However, the first and second elastic members 70, 80 may be fixed to the first base 50 and the supported object 100 using bolts or the like to prevent the first elastic member 70 and the second elastic member 80 from moving between the first base 50 and the supported object 100.

[0022] The parallel linear guide 1 is configured to support the supported object 100 from below by a first base 50 on which the first elastic member 70 is placed and a second base 60 on which the second elastic member 80 is placed. Furthermore, the parallel linear guide 1 is configured so that the supported object 100 moves in the Y direction by the guide blocks 31 to 34 moving along the guide rails 11 and 12 and the guide blocks 41 to 44 moving along the guide rails 21 and 22.

[0023] The parallel linear guide 1 configured as described above further includes a flexible member 90. The flexible member 90 is a substantially rectangular, flat member, and is disposed so as to be interposed between the first linear guide rail 10 and the second linear guide rail 20, which are disposed parallel to each other.

[0024] As shown in Figure 2, the flexible member 90 is a laminate formed by stacking flat plates in the vertical direction. The flat plates can be made of a metal material commonly used in the industrial field, or a composite material such as fiber-reinforced plastic (FRP), fiber-glass reinforced plastic (GFRP), or carbon-fiber reinforced plastic (CFRP). By configuring the flexible member 90 from stacked flat plates, the strength in the X direction and the rigidity in the vertical direction can be independently and appropriately set by changing the number and thickness of the flat plates.

[0025] In this embodiment, as an example, one flexible member 90 can be formed by a laminate of six stainless steel plates each having a thickness of 2 to 3 mm.

[0026] An end 91 of the flexible member 90 on the first base 50 side in the X direction is fixed to the end 51 of the first base 50. For example, by screwing a bolt 93 inserted from the underside of the first base 50 into a bolt receiving member 94 arranged on the upper surface of the flexible member 90, the end 51 of the first base 50 and the end 91 of the flexible member 90 are fixed together.

[0027] Furthermore, an end 92 of the flexible member 90 on the second base 60 side in the X direction is fixed to the underside of the supported member 100. For example, a bolt 95 is inserted from the underside of the flexible member 90 and screwed into a threaded hole 100h formed in the supported member 100, thereby achieving fixation between the end 92 of the flexible member 90 and the supported member 100. A spacer member 96 is arranged between the upper surface of the end of the flexible member 90 and the underside of the supported member 100, as necessary.

[0028] The flexible member 90 arranged in this manner functions as a member that allows the first base 50 and the second base 60 to move in the vertical direction.

[0029] 3, the parallel linear guide 1 further includes a universal joint 110 that connects the second base 60 and the supported object 100. The universal joint 110 includes a first joint portion 111, a second joint portion 112, and a link portion 113.

[0030] The first joint portion 111 has a ball joint 114, and is fastened (fixed) to the Y-direction end portion 61 (corner portion) of the second base 60 with a bolt 115. The second joint portion 112 has a ball joint 116, and is fastened (fixed) to the underside of the supported object 100 with a bolt 117. The link portion 113 extends linearly in the Y direction, and is connected to the ball joint 114 of the first joint portion 111 and the ball joint 116 of the second joint portion 112. The link portion 113 is a cylindrical or rectangular member, and is fixed in the axial direction of the link portion 113. In other words, the link portion 113 is a member that does not move in the Y direction.

[0031] The link portion 113 is connected to the first joint portion 111 and the second joint portion 112 by ball joints 114 and 116 having spherical seats. This allows the link portion 113 and the first joint portion 111, and the link portion 113 and the second joint portion 112 to move in any direction in the universal joint 110. On the other hand, because the universal joint 110 is arranged along the Y direction by the link portion 113, it can support the second base 60 in the Y direction, which is the movement direction of the supported object 100.

[0032] In this way, the universal joint 110 functions to support the force input from the Y direction while allowing displacement of the second base 60 in the X and Z directions, thereby preventing shear forces from occurring in the second elastic member 80 due to resistance forces that hinder movement of the guide blocks 41 to 44.

[0033] [Operation and Effect] The parallel linear guide 1 according to this embodiment is capable of moving the supported object 100 in a predetermined direction (Y direction) while supporting it from below. The parallel linear guide 1 includes a first linear guide rail 10 and a second linear guide rail 20 that extend linearly in a first direction (Y direction) and are arranged parallel to each other in a second direction (X direction) that is perpendicular to the first direction (Y direction), a first guide block 30 and a second guide block 40 that are attached to the first linear guide rail 10 and the second linear guide rail, respectively, and are movable along the linear guide rails, and a first base 50 and a second base 60 that are fixed to the upper surfaces of the first guide block 30 and the second guide block 40, respectively. The parallel linear guide 1 further includes a first elastic member 70 and a second elastic member 80 sandwiched between the upper surface of the first base 50 and the lower surface of the supported object 100 and between the upper surface of the second base 60 and the lower surface of the supported object 100, and a plate-like flexible member 90 positioned between the parallel-arranged first linear guide rail 10 and the second linear guide rail 20 to allow vertical movement of the first base 50. An end 91 of the flexible member 90 on the first base 50 side in the second direction (Y direction) is fixed to the end 51 of the first base 50, and an end 92 of the flexible member 90 on the second base 60 side in the second direction (Y direction) is fixed to the lower surface of the supported object 100.

[0034] In a conventional guide device equipped with a feed mechanism that has parallel guide rails, where the parallelism of the guide rails is low, the resistance to movement of the guide block increases, hindering smooth movement. Also, where the parallelism of the guide rails is low, distortion caused by the movement of the guide block is concentrated, which easily accumulates damage and can lead to damage to the device.

[0035] In contrast, with the parallel linear guide 1 according to this embodiment, even if the parallelism accuracy between the first linear guide rail 10 and the second linear guide rail 20 varies depending on the location, the distortion caused by the fluctuation in the distance between the first guide block 30 and the second guide block 40 that occurs when the supported object 100 moves along the first and second linear guide rails 10, 20 can be absorbed by the elasticity of the first elastic member 70 and the second elastic member 80.

[0036] In addition, the parallel linear guide 1 is provided between the first linear guide rail 10 and the second linear guide rail 20, and is equipped with a flexible member 90 having one end connected to the first base 50 and the other end connected to the supported object 100.

[0037] The flexible member 90 plays a role in transmitting, when a force acts on the supported object 100 in the first direction (X direction), the force to the first base 50 without passing through the first elastic member 70 and the second elastic member 80. For this reason, the parallel linear guide 1 has a buffering effect in the up-down direction (Z direction) due to the first elastic member 70 and the second elastic member 80 being compressed by the supported object 100 and due to the elastic deformation of the flexible member 90, and when a force acts in the first direction (X direction), the force is transmitted by the flexible member 90, thereby preventing a shear force from acting on the first elastic member 70 and the second elastic member 80.

[0038] In other words, the parallel linear guide 1 is equipped with first and second elastic members 70, 80 and a flexible member 90, and thereby forms a flexible coupling mechanism that has a buffering function in the vertical and horizontal directions when the first and second guide blocks 30, 40 that support the supported object 100 move along the first and second linear guide rails 10, 20.

[0039] Therefore, even if the horizontal accuracy between the first linear guide rail 10 and the second linear guide rail 20 varies depending on the location, the parallel linear guide 1 can absorb distortion caused by fluctuations in the height of the first guide block 30 and the second guide block 40 that occur when the supported object 100 moves along the first linear guide rail 10 and the second linear guide rail 20 by the elasticity of the first elastic member 70 and the elasticity of the second elastic member 80, and the bending of the bending member 90.

[0040] In other words, the parallel linear guide 1 can absorb distortion caused by variations in horizontal accuracy between the first linear guide rail 10 and the second linear guide rail 20 through a cushioning action that combines "rubber elasticity" and "spring elasticity."

[0041] Therefore, the parallel linear guide 1 can more effectively reduce the movement resistance that occurs between the first linear guide rail 10 and the first guide block 30, or between the second linear guide rail 20 and the second guide block 40. This allows the supported object 100 to move more smoothly. As a result, it is also possible to achieve a longer lifespan for the parallel linear guide 1.

[0042] In the parallel linear guide 1, the first elastic member 70 and the second elastic member 80 are flat rubber members, and the first elastic member 70 abuts against the upper surface of the first base 50 and the lower surface of the supported object 100, and the second elastic member 80 abuts against the upper surface of the second base 60 and the lower surface of the supported object 100.

[0043] The first elastic member 70 is not fixed to the first base 50 or the supported person 100, and the second elastic member 80 is not fixed to the second base 60 or the supported person 100. By configuring the first and second elastic members 70, 80 to be sandwiched between the first and second bases 50, 60 and the supported person 100 in this way, the first and second elastic members 70, 80 become easily deformed, and the cushioning function of the first elastic member 70 and the second elastic member 80 can be improved.

[0044] Furthermore, in the parallel linear guide 1, the flexible member 90 is a laminated body in which flat plates are stacked in the vertical direction, and the strength in the X direction and the rigidity in the vertical direction can be set independently and appropriately.

[0045] In the parallel linear guide 1, the flexible member 90 is required to support a load in the X direction and to bend in the vertical direction (Z direction). If the flexible member were to be constructed from a single plate, it would need to be an extremely wide and thin plate in order to have the cross-sectional area to support the load in the X direction and reduce the rigidity in the vertical direction. On the other hand, by constructing the flexible member 90 from stacked flat plates, it can be made smaller so that it can easily fit into the dimensions required for the parallel linear guide 1 while still performing the same function. Furthermore, by changing the number and thickness of the flat plates, the strength in the X direction and the rigidity in the vertical direction can be independently and appropriately set.

[0046] This allows the parallel linear guide 1 to be able to support loads in the X direction while also being able to deflect in the vertical direction, and even if there is variation in the horizontal accuracy between the first linear guide rail 10 and the second linear guide rail 20, it is possible to prevent excessive force from being generated in the vertical direction of the parallel linear guide 1.

[0047] The parallel linear guide 1 further includes a universal joint 110 that connects the second base 60 and the supported object 100. The universal joint 110 includes a first joint portion 111 that is fixed to the end portion 61 of the second base 60 in the first direction (Y direction), a second joint portion 112 that is fixed to the underside of the supported object 100, and a link portion 113 that extends linearly in the first direction (Y direction) and connects the first joint portion 111 and the second joint portion 112.

[0048] The universal joint 110 serves to support the second elastic member 80, which provides a buffering effect between the second base 60 and the supported object 100, only in the first direction (Y direction). This prevents excessive shear force from acting on the second elastic member 80 due to the movement resistance force generated between the second linear guide rail 20 and the second guide block 40.

[0049] The parallel linear guide 1 has a buffering effect in the X direction and the vertical direction (Z direction) due to the elastic deformation of the second elastic member 80, and is further supported in the Y direction by the rigidity of the universal joint 110.

[0050] As a result, distortion caused by fluctuations in all directions of the first guide block 30 and the second guide block 40 can be absorbed by the first elastic member 70, the second elastic member 80, the flexible member 90 and the universal joint 110, allowing the supported object 100 to move more smoothly.

[0051] In the universal joint 110, the link portion 113 and the first joint portion 111, and the link portion 113 and the second joint portion 112 can move in any direction due to the respective spherical seats. On the other hand, in the parallel linear guide 1, movement in the Y direction between the supported object 100 and the second base 60 is restricted by the link portion 113 to the extent that the buffering action between the second base 60 and the supported object 100 by the second elastic member 80 is not hindered.

[0052] Therefore, in the parallel linear guide 1, when a movement resistance force or an inertial force that is difficult to absorb by the elastic force of the second elastic member 80 acts in the Y direction, for example, when the supported object 100 moves, the movement in the Y direction between the supported object 100 and the second base 60 is restricted by the link portion 113. Therefore, it is possible to prevent excessive shear stress from being applied to the second elastic member 80.

[0053] In particular, the universal joint 110 is a member that physically connects the second base 60 and the supported object 100, and is disposed parallel to the second guide rail 20. Therefore, the universal joint 110 does not generate a force that would prevent the first and second guide blocks 30, 40 from moving along the first and second linear guide rails 10, 20.

[0054] Therefore, the parallel linear guide 1 can absorb distortion caused by fluctuations in all directions of the first guide block 30 and the second guide block 40 using the first elastic member 70, the second elastic member 80, the flexible member 90 and the universal joint 110, allowing the supported object 100 to move more smoothly.

[0055] As described above, the parallel linear guide 1 of this embodiment can tolerate variations in the parallelism accuracy between the first linear guide rail 10 and the second linear guide rail. This makes it possible to build a device with a structure of multiple guide rails 11, 12, 21, and 22 that requires even stricter parallelism accuracy. This allows the weight of the supported object 100 and the weight of the weight that can be placed on the supported object 100 to be increased. This also has the advantage of broadening the range of application of the parallel linear guide 1.

[0056] [Other Embodiments] The above describes embodiments of the present invention, but the above embodiments merely illustrate some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0057] In this embodiment, the first linear guide rail 10 has been described as having two guide rails 11, 12, but the number is not limited to two. There may be one, or two or more. The same applies to the second linear guide rail 20. The number of guide rails included in the first linear guide rail 10 and the number of guide rails included in the second linear guide rail 20 may be different.

[0058] Supported object 100 may have a shape other than a plate. For example, supported object 100 may be a rectangular parallelepiped or cubic structure having a thickness in the vertical direction, and supported object 100 may constitute a weight (heavy object). In such a case, the first elastic member and the second elastic member may be directly attached to the weight.

[0059] The number of guide blocks 31, 32, 33, and 34 constituting the first guide block 30 is not limited to four as exemplified in this embodiment. Furthermore, the number of guide blocks constituting the first guide block 30 and the number of guide blocks constituting the second guide block 40 may be different.

[0060] In this embodiment, methods for physically fastening members to each other include fastening with bolts and screws, as well as rivets, welding, etc., depending on the materials used in the fastening parts. In this embodiment, the number of bolts and screws in the fastening parts is not limited to those exemplified in the embodiment.

[0061] In the present embodiment, it has been described that universal joint 110 connecting second base 60 and supported object 100 includes link portion 113, first joint portion 111, and second joint portion 112, each having a spherical seat at the connecting portion, but the mechanism connecting second base 60 and supported object 100 is not limited to this structure. Instead of a configuration consisting of a link portion and a joint portion connected by a spherical seat, second base 60 and supported object 100 may be fixed together by, for example, an elastically deformable rod-shaped member.

[0062] In this embodiment, the first base 50 to which the flexible member 90 is attached and the supported object 100 may be fixed together using bolts or the like. In this case, a spacer slightly longer than the thickness of the first elastic member 70 in a state compressed by the supported object 100 may be interposed between the first base 50 and the supported object 100.

[0063] This allows the first elastic member 70 and the spacer to support the supported object 100. The first elastic member 70 is supported by the spacer and can support the supported object 100 in a state just before being compressed by the weight of the supported object 100, that is, in a state in which the first elastic member 70 retains its degree of freedom in the up and down direction. Therefore, when an upward load acts on the supported object 100, the supported object 100 can be prevented from deviating from the first base 50 without impairing the up and down buffering effect of the first elastic member 70.

[0064] On the other hand, when fixing the first base 50 and the supported object 100 using bolts or the like, a spacer that is slightly shorter than the thickness of the first elastic member 70 when compressed by the supported object 100 may be interposed between the first base 50 and the supported object 100.

[0065] According to this, when the first base 50 and the supported object 100 are fastened together, the first elastic member 70 is further compressed from the state in which it is compressed by the weight of the supported object 100 until it abuts against the spacer. Therefore, the first elastic member 70 can buffer horizontal movement when an excessive horizontal load greater than the fastening force compressing the first elastic member 70 is applied, and can also suppress vertical displacement of the supported object 100 until a vertical load greater than the fastening force is applied.

[0066] In addition, the flexible member 90 and the first elastic member 70 can be omitted, and the first base 50 and the supported object 100 can be rigidly fixed, thereby leaving only the horizontal degree of freedom due to the elasticity of the second elastic member 80.

[0067] This application claims priority based on Japanese Patent Application No. 2024-134950, filed with the Japan Patent Office on August 13, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. A parallel linear guide capable of moving a supported person in a predetermined direction while supporting them from below, comprising: first and second linear guide rails that extend linearly in a first direction and are arranged parallel to each other in a second direction that is perpendicular to the first direction; first and second guide blocks that are attached to the first and second linear guide rails, respectively, and are movable along the linear guide rails; first and second bases that are fixed to the upper surfaces of the first and second guide blocks, respectively; first and second elastic members that are sandwiched between the upper surface of the first base and the lower surface of the supported person, and between the upper surface of the second base and the lower surface of the supported person; and a plate-like flexible member that is located between the first and second linear guide rails that are arranged in parallel, and allows the first base to move in the up and down direction, wherein the end of the flexible member that faces the first base in the second direction is fixed to the end of the first base, and the end of the flexible member that faces the second base in the second direction is fixed to the lower surface of the supported person.

2. A parallel linear guide according to claim 1, wherein the first and second elastic members are flat rubber members, the first elastic member abuts against the upper surface of the first base and the lower surface of the supported object, and the second elastic member abuts against the upper surface of the second base and the lower surface of the supported object.

3. A parallel linear guide according to claim 1, wherein the flexible member is a laminated body in which a plurality of flat plates are stacked in the vertical direction.

4. A parallel linear guide as claimed in any one of claims 1 to 3, further comprising a universal joint connecting the second base and the supported object, the universal joint comprising: a first joint portion fixed to the end of the second base in the first direction; a second joint portion fixed to the underside of the supported object; and a link portion extending linearly in the first direction and connecting the first joint portion and the second joint portion.

5. A parallel linear guide according to claim 1, wherein the first and second linear guide rails comprise a plurality of guide rails extending in the first direction and arranged parallel to the second direction, the first and second guide blocks comprise guide blocks respectively provided on the plurality of guide rails, the first base is fixed on the plurality of guide blocks constituting the first guide block, and the second base is fixed on the plurality of guide blocks constituting the second guide block.

6. A parallel linear guide according to claim 1, wherein the first and second guide blocks comprise a plurality of guide blocks arranged in parallel in the direction of extension of the first and second linear guide rails, the first base is fixed onto the plurality of guide blocks constituting the first guide block, and the second base is fixed onto the plurality of guide blocks constituting the second guide block.

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