JPH09323896A - Table elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a table to make a complex movement such as horizontal movement and inclined movement as well as to ascent and descent as giving thrust to the supporting center of the table. SOLUTION: This table elevating device 10 making a table 20 ascent and descent with respect to a base 12 by using a link mechanism 30 forming a set composed of respectively two links 31, 32, makes a reciprocating movement of fulcrums 31a, 32a on the base 12 side of the two links 31, 32 independently and linearly along track rails 13a, 13b, transmits the movement to fulcrums 31b, 32b on the table 20 side of the two links 31, 32 and makes a reciprocating movement of the fulcrums 31b, 32b independently and linearly along track rails 23a, 23b on the table 20 side. Thus it makes the table 20 to make a vertical movement when the fulcrums 31a, 32a on the base 12 side of the two links 31, 32 move at the identical speed and mutually in the distance direction, a horizontal movement when the fulcrums 31a, 32a move at the identical speed and in the identical direction, and an inclined movement when the fulcrums 31a, 32a move at non-identical speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table elevating device for elevating and lowering a table with respect to a reference base using a pair of link mechanisms each consisting of two links.

[0002]

2. Description of the Related Art FIG. 9 is a schematic view of a conventional table lifting device 50. A conventional table lifting device 50 generally includes a table 54 that is lifted and lowered with respect to a reference base 52.
, A pair of link mechanisms arranged in an X shape and each consisting of two links 55, 56, a pair of parallel track rails 57 fixed to the base 52, and slidable along each track rail 57. Bearing block 58 mounted on
And have. The two links 55, 56 are connected by a central shaft member 59 at the intersecting position. The bearing block 58 linearly reciprocates along the track rail 57 by a drive mechanism (not shown) such as a ball screw mechanism. Base 52 of two links 55, 56
One of the side fulcrums 55a is rotatably supported by the bearing block 58, and the other fulcrum 56a is rotatably but immovably supported by the base 52. On the other hand, the table side 55 of the two links 55, 56
b and 56b are the same as the base 52 side except that a drive mechanism is not provided.

[0003]

In the above-described conventional table elevating / lowering device 50, the supporting center (equal to the position of the central shaft member 59) for supporting the load of the mounted object of the table 54 moves, so that stable support is performed. It has the drawback that it cannot. In the example of FIG. 9, the mounted object 60 is the table 54.
It is placed in the center of. In the solid line position where the table 54 is lowered, the mounted object 60 is directly above the support center of the table elevating / lowering device 50 and is stably supported by the link mechanism including the two links 55 and 56. However, when the table 54 is lifted to the position indicated by the alternate long and short dash line, the load 60 deviates from just above the center of the support and the table 54 is rotated, even though the load is not moved.

Further, the table 54 only moves in the vertical direction while keeping parallel to the base 52, and there is a drawback that complicated movements such as horizontal movement and tilting movement of the table 54 cannot be provided.

In view of the above-mentioned problems of the prior art, the present invention is capable of moving up and down while applying a vertical thrust to the mounted object of the table, and also performs complicated movements such as horizontal movement and tilt movement of the table. An object is to provide a table lifting device to be obtained.

It is another object of the present invention to provide a table elevating / lowering device having a simple structure and capable of elevating / lowering while applying vertical thrust to a mounted object on the table.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a base, a table supported so as to be able to move up and down, horizontally or tilted with respect to the base, and the base and the table. A link mechanism device composed of a pair of connecting members for connecting with each other, a pair of first linear guide members provided on the base, a pair of second linear guide members provided on the table, and a connecting member A pair of first linear sliding members which are provided at one end of the first linear guide member independently and linearly with respect to the base, and the other end of the connecting member, Independently and linearly with respect to the table, the pair of second linear sliding members that reciprocate linearly on the second linear guiding member and the movement of the first linear sliding member on the base side are moved. Provided is a table lifting device including a transmission mechanism device for transmitting to a second linear sliding member on the table side.

According to a second aspect of the present invention, in the table lifting device according to the first aspect, the link mechanism device is connected by a central member at a crossing position of a pair of connecting members. .

According to a third aspect of the present invention, there is provided a link mechanism comprising a base, a table supported so as to be capable of moving up and down with respect to the base, and a pair of connecting members for connecting the base and the table. Device, a central member that rotatably connects the link mechanism device at the intersection position of the pair of connecting members, a pair of first linear guide members provided on the base, and a pair of first linear guide members provided on the table. A second linear guide member, a pair of first linear sliding members which are provided at one end of the connecting member and which reciprocate independently and linearly on the base on the first linear guide member; A pair of second linear sliding members which are provided at the other end and reciprocate independently and linearly on the second linear guide member with respect to the table, and a first linear sliding member on the base side. And a transmission mechanism device for transmitting the movement of the member to the second linear sliding member on the table side. - to provide a bull lifting device.

The invention according to claim 4 is the table lifting device according to any one of claims 1 to 3, wherein the first and second linear sliding members are linear sliding blocks. And a pinion gear, a rack in which the first and second linear guide members mesh with the orbital rail and the pinion gear that slide the linear sliding block, and a connecting member include a pinion on the base and table side. The first and second shaft members fixedly provided with gears, and the transmission mechanism device includes a rotation transmission mechanism that transmits the rotation of the first shaft member to the second shaft member. A table lifting device is provided.

A preferred construction of the present invention is claim 1.
The present invention described in (1), a base, a table supported so as to be able to move up and down, horizontally or incline relative to the base, and a link mechanism that forms a pair of two links that connect the base and the table,
The movement fulcrum on the base side of the two links that independently and linearly reciprocate with respect to the base, and the table side of the two links that independently and linearly reciprocate with respect to the table Provided is a table lifting device including a moving fulcrum and a motion transmitting mechanism that transmits the motion of each moving fulcrum on the base side to each moving fulcrum on the table side.

As a result, when the fulcrums of the two links on the base side move at the same speed and in the perspective direction, the table is moved up and down, and when they move at the same speed and in the same direction, the table is moved horizontally. The movement and, if moving at non-uniform speeds, tilt the table.

Further, the preferred construction of the present invention as set forth in claim 1 will be described in detail. A table elevating device for elevating and lowering a table with respect to a base by using a link mechanism, which comprises a track rail and a track rail. 2 slidably attached
And a pair of first linear guides having two bearing blocks fixed to the base so that the two rails are parallel to each other, and parallel to the rails of the first linear guide. At least one first rack fixed to the base, two first sliding bases connecting one bearing block of one of the pair of first linear guides, and the first sliding A first shaft member extending in a direction orthogonal to a track rail of a first linear guide device rotatably supported on a base body and a first shaft member are independently rotationally driven in forward and reverse directions. Rotating drive means, a first pinion gear fixed to the first shaft member and arranged to mesh with the first rack, a track rail, and two slidably mounted along the track rail. Each has a bearing block and a table A pair of second straight guide devices fixed so that the track rails are parallel to the track rails of the first straight guide device, and fixed to the table so that they are parallel to the track rails of the second straight guide device. At least one second rack, two second sliding bases that connect the bearing blocks of one of the pair of second linear guides, and the second sliding bases are respectively rotatable. A second shaft member that extends in a direction orthogonal to the track rail of the second linear guide device that is axially supported, and a second shaft member that is fixed to the second shaft member and that is arranged to mesh with the second rack. A pinion gear,
A pair of link mechanisms composed of two links arranged in an X shape for connecting the first shaft member and the second shaft member, and rotation of the first shaft member to the second shaft member. Provided is a table lifting device configured to include a rotation transmission mechanism for transmitting.

According to a second aspect of the present invention, in the first aspect, the two links of the link mechanism are connected by a central shaft member at the intersecting position.

Further, as a preferred configuration of the present invention, claim 3
The present invention described in [1] is a base, a table supported so as to be able to move up and down with respect to the base, and a pair of link mechanisms composed of two links arranged in an X shape connecting the base and the table. , A central shaft member that rotatably connects the two links to each other at an intersecting position, and a base-side movement fulcrum of the two links that linearly reciprocates in a direction toward or away from the base, The table-side movement fulcrum of the two links that linearly reciprocate in the direction toward or away from the table and the linear motion of the fulcrum on the base side of one of the two links (EN) Provided is a table elevating device including a motion transmitting mechanism configured to transmit to the other base-side fulcrum and two table-side fulcrums of two links to thereby elevate and lower the table.

Further, the preferred construction of the present invention as set forth in claim 3 will be described in detail. A table elevating device for elevating and lowering a table with respect to a base using a link mechanism, which comprises a track rail and a track rail. And a pair of first linear guide devices each having two bearing blocks slidably attached to each other, and fixed to the base so that two track rails are parallel to each other, and a first linear guide device. At least one first rack fixed to the base parallel to the track rails of the device and two first slides connecting one bearing block of one of the pair of first linear guides. A base body, two first shaft members extending in a direction orthogonal to a track rail of a first linear guide rotatably supported by the first sliding base body, and a first shaft member. Rotational drive means for rotationally driving one A first pinion gear fixed to the first shaft member and arranged to mesh with the first rack; a track rail and two bearing blocks slidably mounted along the track rail. Have,
A pair of second linear guide devices fixed to the table so that the track rails are parallel to the track rails of the first linear guide device, and a table so that the track rails of the second linear guide device are parallel to each other. Fixed to the at least one second rack, two second sliding bases connecting one bearing block of a pair of second linear guides, and a second sliding base respectively rotating. A second shaft member that extends in a direction orthogonal to the track rail of a second linear guide device that is freely rotatably supported, and a first shaft member that is fixed to the second shaft member and that is engaged with the second rack. Two pinion gears and two links arranged in an X-shape connecting the first shaft member and the second shaft member, the two links being connected by a central shaft member at the intersecting position. And a pair of link mechanism and Providing a table elevating device comprising constructed and a rotation transmitting mechanism for transmitting the one rotation of the shaft member to the other and two second shaft member of the first shaft member.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A table lifting device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an exploded perspective view of an embodiment of a table lifting / lowering device according to the present invention, FIG. 2 is a schematic side view thereof, and FIGS. FIG.

The table lifting / lowering device 10 according to the present invention includes a base 12 and a table 20 each having two links 3.
It is lifted and lowered by using a pair of link mechanisms 30 composed of 1 and 32, and a fulcrum 3 of the two links 31 and 32 on the base side.
1a and 32a are independently and linearly reciprocally moved with respect to the base 12, and the movement is performed by the two links 31, 3
2 is transmitted to the fulcrums 31b and 32b on the table 20 side to reciprocate independently and linearly with respect to the table 12.

The fulcrum 3 on the base side of the two links 31, 32
A mechanism for independently and linearly reciprocating 1a, 32a relative to the base 12 is roughly a track rail 13a and two bearing blocks 13b slidably mounted along the track rail 13a. A pair of linear guide devices 13 having a rack and pinion mechanism 14, two first sliding frames 15, and two first shafts rotatably supported by the first sliding frames 15. Member 16 and
It includes two motors 17 for independently rotationally driving the two first shaft members 16 in the forward and reverse directions.

The pair of linear guide devices 13 are fixed to the base 12 so that their track rails 13a are parallel to each other. Each of the track rails 13a is provided with two bearing blocks 13b through a large number of balls pre-compressed (preloaded).
It is slidably fitted along 3a. The linear guide device 13 allows the bearing block 13b to move smoothly, with high accuracy and high rigidity.

The first rack 14a of the rack and pinion mechanism 14 is provided outside the pair of track rails 13a, respectively.
Are fixed to the base 12 so that the rails are parallel to the track rail 13a. In the illustrated preferred embodiment, a first rack 14 is provided on each outer side of the pair of track rails 13a.
Although a is arranged, it is of course possible to provide only one.

Of the two bearing blocks 13b fitted to the track rails 13a, the first sliding frame 15 connecting one of the bearing blocks 13b is a plate-like member, and the shoulder portions 15a at both ends.
Are fixed to each bearing block 13b. The pair of first sliding frames 15 attached in this way
Are movable independently of each other.

A bearing 15c containing a radial bearing is fixed above both shoulders 15a of the first sliding frame 15, and the first shaft member 16 is rotatably supported by the pair of bearings 15c. Supported. The first shaft member 16 extends in a direction orthogonal to the axial direction of the track rail 13a, which is the traveling direction of the first sliding frame 15. Central flat portion 15b of the first sliding frame 15
A motor 17 is fixed on the upper side, and a gear 17a is fixed on the tip of the rotation shaft thereof. On the other hand, the gear 16a is also fixed to the corresponding position of the first shaft member 16. As a result, when the motor 17 is rotationally driven in the forward and reverse directions, the first shaft member 16 is rotationally driven in the forward and reverse directions.

Pinion gears 14b of the rack and pinion mechanism 14 are fixed to both ends of the first shaft member 16 and mesh with the first rack 14a fixed to the base 12. When the first shaft member 16 is rotated by the driving of the motor 17, the rack and pinion mechanism 14 provided at both ends of the first shaft member 16 supports the first shaft member 16, and thus the first shaft member 16. The first sliding frame 15 reciprocates in the longitudinal direction of the track rail 13a. Since each independently operating motor 17 is arranged in each first sliding frame 15, the movement of each first sliding frame 15 is also performed independently. As a result, each first sliding frame 15
Of the two first shaft members 16 rotatably supported on the base, that is, the fulcrums 31a, 3 on the base 12 side of the links 31, 32.
2a are moved independently of each other.

Except that the motor 17 and the drive system related thereto are not present on the table 20, the fulcrums 31a and 32a on the base side of the two links 31 and 32 described above are provided.
The same mechanism as the mechanism that reciprocates independently and linearly with respect to the base 12 is provided upside down. The drive system does not exist because the fulcrums 31b and 32b of the two links 31 and 32 on the table 20 side are configured to be driven by the rotation transmission mechanism including the link mechanism 30 described later. is there. A mechanism for independently and linearly reciprocating the fulcrums 31b, 32b of the two links 31, 32 on the table 20 side with respect to the table 12 is roughly along the track rail 23a and the track rail 23a. Two slidably mounted bearing blocks 23b
A pair of linear guide devices 23 each having a rack and pinion mechanism 24, two second sliding frames 25, and a second sliding frame 15 rotatably supported by the second sliding frame 15.
Two second shaft members 26, but detailed description thereof will be omitted.

The link mechanism 30 is arranged in a pair in the front-rear direction to support the table 20 and is composed of two links 31 and 32 arranged in an X shape. In the illustrated preferred embodiment, the two links 31, 32 are not interconnected and are independently movable. The fulcrums 31a and 32a on the base side of the two links 31 and 32 are
Each of them is constituted by two first shaft members 16 rotatably supported by two first sliding frames 15 which independently reciprocate in the longitudinal direction of the track rail 13a. On the other hand, the fulcrum 31b of the links 31, 32 on the table 20 side,
32b is constituted by two second shaft members 26 that are rotatably supported by two second slide frames 25 that reciprocate independently in the longitudinal direction of the track rail 23a.

Pulleys 16b and 26b are fixed to substantially the centers of the first shaft member 16 and the second shaft member 26, and a synchronous belt 28 is stretched over these pulleys to drive them both. It is connected. Therefore, the motor 17
When the first shaft member 16 is driven to rotate, the rotation causes the second shaft member 16 on the table 20 side to rotate via the pulley 16b, the synchronous belt 28, and the pulley 26b that form the rotation transmission mechanism. It will be. The motion transmission mechanism is 2
Two motors 17 for independently rotationally driving the two first shaft members 16, the above-described rotation transmission mechanism, and the pair of link mechanisms 3
0 and the rack and pinion mechanism 14.

Next, the operation of the table lifting device shown in FIG. 1 will be described with reference to FIG.

From the position of the solid line shown in FIG.
The two motors 17 are operated to operate the two links 31, 32.
The fulcrums 31a and 32a are moved outward at the same speed. As a result, the table 20 rises by the height L1 while maintaining the horizontal state up to the position of the chain double-dashed line in the figure.
The two motors 17 are rotatably operated in the opposite direction to the above-described case from the position of the chain double-dashed line in the figure, and the two links 31, 32 are connected.
When the fulcrums 31a and 32a of the table 20 are moved inward at the same speed, the table 20 maintains the horizontal state while maintaining the height L.
It descends by 1. The crossing position of the two links 31 and 32 is the support center where the support transmission lines that support the load of the load are gathered via the two links 31 and 32, but this support center moves only in the vertical direction. Does not move horizontally.
Therefore, the table lifting device of the present invention has an advantage that it is possible to provide a structure capable of always stably supporting the mounted object placed on the table 20 during the lifting motion.

When the fulcrums 31a, 32a of the two links 31, 32 are moved at the same speed and in the same direction from the position of the chain double-dashed line shown in FIG. 3 (b), the table 20 is shown by the solid line in the figure. It moves horizontally to the position for the length L2 while maintaining the horizontal state. The height of the table 20 is shown in FIG.
It can be stopped at any position by the principle described in relation to (a), and by combining these,
You can move the payload to any location. Of course, the vertical movement and the horizontal movement can be performed separately or simultaneously.

When one of the fulcrums 31a and 32a is fixed and the other is moved from the position indicated by the solid line in FIG. 3 (b), the table 20 tilts as shown in FIG. 3 (c).
The same applies when the fulcrums 31a and 32a are moved at different speeds.

Thus, in the embodiment shown in FIG.
There is an advantage that the table 20 can be moved in various forms such as raising and lowering, horizontal movement, tilting alone, or a combination thereof.

4 and 5 are a side view and a front view for explaining the operation of the table lifting device according to the second embodiment of the present invention.

The table lifting device shown in FIGS. 4 and 5 is the same as the table lifting device shown in FIGS.
It is characterized in that two links 31, 32 arranged in an X shape are connected by a central shaft member 34 at a central intersecting position.

As a result, the tilt movement of the table 20 is impossible, but with respect to the vertical movement of the height L3 and the horizontal movement of the length L4, the same principle as that of the table lifting device shown in FIGS. It can be carried out. In this embodiment, since the two links 31 and 32 are connected by the central shaft member 34 at the central intersecting position, each link has a structure in which it is difficult to buckle and has an advantage of being able to withstand a large load.

6 and 7 are a side view and a front view for explaining the operation of the table lifting device according to the third aspect of the present invention.

The table raising / lowering device shown in FIGS. 6 and 7 is different from the table raising / lowering device shown in FIGS. 4 and 5 in that there is only one motor on the base 12 side, and therefore the rotations thereof are paired. The first shaft member 16 and the second shaft member 26 on the side of the table 20 are basically the same in structure except that the mechanisms are different.

As best shown in FIG. 6, center pulleys 34a and 34b are coaxially and rotatably mounted on the central shaft member 34 so as not to rotate relative to each other. The pulley 16b of the first shaft member 16 and the pulley 26b of the second shaft member 26 on the side driven to rotate by the motor 17.
The synchronization belt 28a hung between and is shown in FIG.
It has been passed over as shown in. The synchronous belt 28b hung between the pulley 16b of the other first shaft member 16 and the pulley 26b of the second shaft member 26 on the base 12 side is shown in FIG.
It is laid over as shown in (b).

By driving the motor 17, as shown in FIG.
As shown in (a), when the pulley 16b is rotated clockwise, the synchronous belt 28a rotates the pulley 26b clockwise, and the center pulley 34a rotates counterclockwise. As a result, the fulcrum 31a of the two links 31 moves to the right side of the figure, and the fulcrum 31b moves to the left side of the figure. Since the center pulley 34b is fixed to the center pulley 34a in the rotation direction and is rotatably supported by the central shaft member 34, when the center pulley 34a is rotated counterclockwise, the center pulley 34b also rotates counterclockwise. This rotation is performed by the synchronous belt 28b by the pulleys 16b, 2
6b, and each is rotated counterclockwise. As a result, the fulcrum 32a of the two links 32 moves to the left side of the figure, and the fulcrum 32b moves to the right side of the figure.

When the pulley 16b is rotated clockwise by driving the motor 17 in this manner, the table 20
Is elevated by a height L5 from the position indicated by the two-dot chain line in FIG. 7 to the position indicated by the solid line while maintaining the horizontal state, while the pulley 16b
When is rotated counterclockwise, it is lowered by the height L5 contrary to the above. The central shaft member 34, which is the support center for supporting the load of the load, moves only in the vertical direction and does not move in the horizontal direction. Therefore, the table lifting device of the present embodiment has an advantage that it can always stably support the load of the load placed on the table 20 during the lifting motion.

[0042]

INDUSTRIAL APPLICABILITY The present invention is a table elevating device for elevating and lowering a table with respect to a base by using a pair of link mechanisms each consisting of two links. Independently and linearly reciprocates with respect to the base, and transmits the movement to the table-side fulcrum of the two links to independently and linearly reciprocate with respect to the table. Therefore, when the fulcrums on the base side of the two links move at the same speed and in the perspective direction, the table is moved up and down, and at the same speed and in the same direction, the table moves horizontally. And, when moving at non-uniform speeds, the table can be tilted.

Further, in this table lifting device, since the support center moves only in the vertical direction and does not move in the horizontal direction during the lifting motion, it is possible to always stably support the load of the load placed on the table. Has the effect that can.

The present invention also has an effect that when two links of a link mechanism are connected by a central shaft member at their intersecting positions, each link has a structure that is less likely to buckle, and thus can bear a large load. Have

The present invention is also a table elevating device for elevating and lowering a table with respect to a base using a paired link mechanism composed of two links arranged in an X shape. The two shafts are connected by a central shaft member at the intersecting position and linearly reciprocate along one of the fulcrums on the base side of the two links, and at the same time, the movement is performed on the base side of the two links. Is transmitted to the other one of the fulcrums and the two fulcrums on the table side of the two links to linearly reciprocate each fulcrum along the table. Therefore, one driving source, and therefore a simple structure. This has the effect of raising and lowering the table while maintaining it horizontal.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a table lifting device according to a first aspect of the present invention.

FIG. 2 is a schematic side view of the table lifting device of FIG.

3A to 3C are schematic front views for explaining the operation of the table lifting device.

FIG. 4 is a side view of a table lifting device according to a second aspect of the present invention.

5A and 5B are schematic front views for explaining the operation of the table lifting device of FIG.

FIG. 6 is a side view of the table lifting device according to the third aspect of the present invention.

7 is a schematic front view for explaining the operation of the table lifting device of FIG.

8 (a) and 8 (b) are schematic views for explaining a state in which the synchronous belt is wound around in the table lifting device of FIG.

FIG. 9 is a schematic view of a conventional table lifting device.

[Explanation of symbols]

10 table lifting device 12 base 13 linear guide device, 13a track rails 13 and 13b
Bearing block 14 Rack and pinion mechanism, 14a Rack, 14b
Pinion gear 15 Sliding frame, 15a Shoulder, 15b Flat,
15c Bearing 16 Shaft member, 16a Gear, 16b Pulley 17 Motor 20 Table 23 Linear guide device, 23a Track rails 23, 23b
Bearing block 24 Rack and pinion mechanism 25 Sliding frame 26 Shaft member 28 Synchronous belt 30 Link mechanism 31 Link, 31a, 31b fulcrum 32 Link, 32a, 32b fulcrum 34 Central shaft member, 34a, 34b Center pulley

Claims (4)

[Claims] 1. A link mechanism including a base, a table supported so as to be vertically movable, horizontally or tiltable with respect to the base, and a pair of connecting members connecting the base and the table. A device, a pair of first linear guide members provided on the base, a pair of second linear guide members provided on the table, and a base provided at one end of the connecting member. A pair of first linear sliding members that independently and linearly reciprocate on the first linear guide member, and are provided at the other end of the connecting member, and And a pair of second linear sliding members that reciprocate independently and linearly on the second linear guiding member, and the movement of the first linear sliding member on the base side by the tape. A table elevating device comprising: a transmission mechanism device that transmits the second linear sliding member on the bull side. 2. The table lifting device according to claim 1, wherein the link mechanism device is connected by a central member at an intersecting position of a pair of connecting members. 3. A link mechanism device comprising a base, a table supported so as to be able to move up and down with respect to the base, and a pair of connecting members connecting the base and the table, A central member that rotatably connects the link mechanism device at a crossing position of a pair of connecting members, a pair of first linear guide members provided on the base, and a second pair of second members provided on the table. A linear guide member, and a pair of first linear sliding members that are provided at one end of the connecting member and that reciprocate independently and linearly on the first linear guide member with respect to the base, A pair of second linear sliding members that are provided at the other end of the connecting member and that reciprocate on the second linear guide member independently of the table and linearly; The movement of the first linear sliding member on the table side is changed to the second linear sliding member on the table side. Consisting includes a transmission mechanism unit that transmits to the member, the Te - table elevating device. 4. The table lifting / lowering device according to claim 1, wherein the first and second linear sliding members include a linear sliding block and a pinion gear, A rack in which first and second linear guide members mesh with the orbital rail and the pinion gear that slide the linear slide block, and the connecting member includes the pinion gear on a base and a table side. First and second shaft members fixedly provided, and the rotation transmission mechanism for transmitting the rotation of the first shaft member to the second shaft member by the transmission mechanism device. A table lifting device.