JP2003285994A - Elevating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide smooth elevating movement, size reduction, and simplification in an elevating apparatus. <P>SOLUTION: An elevating mechanism for elevating a placement board 8 is provided with a cam follower 12 engaging with a cylindrical cam member 5 formed with a spiral cam groove 5a on the outer periphery thereof; annular member 6 disposed coaxially to the cam member 5; a driving means 9 for rotating the cam member 5 around the center line thereof; and a guide member 3 for guiding the annular member 6 in the elevating direction Z. The placement board 8 is secured onto the annular member 3. When the cam member 5 rotates, the annular member 6 and the placement board 8 elevate smoothly. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device which is applied to an industrial lift or a transfer robot or a transfer robot used in a clean room to lift and lower an object.

[0002]

2. Description of the Related Art As a conventional lifting device, for example, Japanese Patent Laid-Open No.
The one disclosed in Japanese Patent Publication No. 245334 is known. The lifting device disclosed in this publication has a mounting plate supported by a pair of support arms arranged at substantially the center and vertically extending in a screw rod, a nut screwed with the screw rod, and the screw rod. A table is integrally provided to elevate and lower, a guide shaft for guiding the elevating table in the vertical direction, a motor for rotating a screw rod, and the like. Then, by driving the motor to rotate the screw rod, the elevating table, that is, the mounting plate is moved up and down to raise or lower the object mounted on the mounting plate to a desired height.

[0003]

By the way, in the above-mentioned conventional lifting device, the drive mechanism for carrying out the lifting operation includes a threaded rod having a relatively small shaft diameter, a nut screwed to the threaded rod, and a threaded rod. Since it is formed by a motor that applies a driving force, the lifting stroke of the lifting table (and the mounting plate) is limited to the range of the stroke in which the nut screwed with the screw rod moves. That is, it is difficult to reduce the height of the device (downsize it) and lengthen the lifting stroke. Further, in order to perform the raising and lowering operation quickly, the rotation speed of the screw rod by the motor must be increased, but this increase in speed may cause deterioration of vibration or noise.

The present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to simplify the structure, reduce the size, reduce the number of parts, etc. To provide a lifting device capable of performing a stable lifting operation by suppressing or preventing the generation of vibration and noise, extending the lifting stroke, and further increasing the lifting speed without increasing the driving speed. It is in.

[0005]

SUMMARY OF THE INVENTION An elevating device of the present invention is an elevating device including a placing plate on which an object to be raised and lowered and an elevating mechanism for elevating the placing plate are provided. A cylindrical cam member having a spiral cam groove formed on the outer peripheral surface or the inner peripheral surface and having an axial center extending in the up-and-down direction, and a cam follower engaging with the cam groove provided and arranged coaxially with the cam member The follower member, a drive means that exerts a driving force that rotates one of the cam member and the follower member around the axis, and a guide member that guides the other of the cam member and the follower member in the vertical direction. The placing plate is fixed to the other of the cam member and the follower member.

According to this structure, when one of the cam member and the follower member is rotated by the driving means, the other of the cam member and the follower member is guided by the guide member to move up and down and is placed on the placing plate. The lifted body is moved to a predetermined height. That is, since the cam member is formed in a cylindrical shape that can set a large radius (distance from the shaft center) at which the cam groove and the cam follower engage with each other, the weight is lighter than that of a solid small-diameter lead screw or the like. A stable cam action can be obtained while simplifying the structure. As a result, it is possible to suppress or prevent the inclination, noise, vibration, etc. of the mounting plate, and obtain a smooth lifting operation.

In the above-mentioned structure, the cam member has the first cam member having the spiral first cam groove formed on the outer peripheral surface thereof and rotatably supported about the axis, and the second cam spiral on the outer peripheral surface. A follower member provided with a first cam follower that engages with the first cam groove; A ring-shaped first that can be raised and lowered
The guide member includes a follower member, a second cam follower that engages with the second cam groove, and an annular second follower member that moves up and down integrally with the first follower member and rotates integrally with the first cam member. Includes a first guide member that guides the first follower member in the vertical direction and a second guide member that guides the second cam member in the vertical direction, the mounting plate is fixed to the second cam member, and the drive means is the first. A configuration can be adopted in which the rotational driving force is applied to one cam member.

According to this structure, the first
When the cam member rotates, the first follower member is guided by the first guide member to move up and down, and the second follower member moves to the first follower member.
It moves up and down integrally with the follower member and rotates integrally with the first cam member, and the second cam member and the mounting plate are guided by the second guide member to ascend and descend, and are mounted on the mounting plate. The elevating body is moved to a predetermined height. That is, since the first cam member and the second cam member are formed in a cylindrical shape so that the radius at which the cam groove and the cam follower engage with each other (the distance from the shaft center) can be set to be large, a solid lead screw with a small diameter, etc. Compared with the above, while achieving the weight reduction and the simplification of the structure, the stable cam action can be obtained, the inclination of the mounting plate, the noise, the vibration and the like can be prevented, and the smooth lifting operation can be obtained. Further, since the first cam member and the second cam member are coaxially arranged in a nested manner, the height of the apparatus (the height when the apparatus is contracted to the lowered position) is reduced, and the apparatus is downsized. The lifting stroke can be set long.

In the above structure, the cam groove and the cam follower may be formed so as to be engaged with each other with a predetermined gap in the radial direction of the cam member. With this configuration, the cam groove and the cam follower do not come into contact with each other in the radial direction (direction orthogonal to the up-and-down direction), so that it is possible to prevent the force pressing the guide member in the radial direction from acting. This allows the sliding surface of the guide member to stick.
It is possible to prevent the occurrence of such problems, and to obtain a smooth lifting operation.

The elevating device of the present invention is an elevating device comprising a mounting plate for mounting an elevating / lowering body and an elevating mechanism for elevating the mounting plate, wherein the elevating mechanism has an outer peripheral surface. A cylindrical male screw member having a multi-threaded male screw and having an axis extending in the up-and-down direction, an annular female screw member provided with a multi-threaded female screw that engages with the multi-threaded male screw, and one of the male screw member and the female screw member. Has a drive means for applying a driving force for rotating the shaft around the axis, and a guide member for guiding the other of the male screw member and the female screw member in the vertical direction, and the above-mentioned mounting plate is fixed to the other of the male screw member and the female screw member. It is characterized by being.

According to this structure, when one of the male screw member and the female screw member is rotated by the driving means, the other of the male screw member and the female screw member is guided by the guide member to move up and down and is placed on the placing plate. The lifted body is moved to a predetermined height. That is, since the male thread member is formed in a cylindrical shape that can set a large radius (distance from the axis) at which the multi-thread male thread and the multi-thread female thread are screwed, compared to a solid, small-diameter lead screw or the like, It is possible to obtain a stable screw feed action while preventing weight reduction and structure simplification, to prevent tilting, noise, vibration and the like of the mounting plate, and to obtain a smooth lifting operation. Also, the adoption of multi-start threads (multi-start male threads and multi-start female threads) increases the lead size,
The raising / lowering operation can be speeded up without increasing the rotation speed by the driving means. Further, since the rotation speed can be set low, noise, vibration, etc. can be further suppressed or prevented.

In the above structure, the male screw member has the first multi-threaded male screw formed on the outer peripheral surface thereof and is supported rotatably about the axis, and coaxially and vertically moves inside the first male screw member. A second male screw member that is arranged so as to be retractable in the direction and has a second multiple male screw formed on the outer peripheral surface, and the female screw member is provided with a first multiple female screw that is screwed with the first multiple male screw and is moved up and down. A possible first female thread member, a second multi-thread female thread to be screwed with the second multi-thread male thread are provided, and the first female thread member moves up and down integrally with the first female thread member and
A second female screw member that rotates integrally with the male screw member,
The guide member includes a first guide member for guiding the first female screw member in the ascending / descending direction and a second guide member for guiding the second male screw member in the ascending / descending direction, and the mounting plate is fixed to the second male screw member and the driving means. Exerts a rotational driving force on the first male screw member,
Configuration can be adopted.

According to this structure, the first driving device drives the first driving device.
When the male screw member rotates, the first female screw member is guided by the first guide member to move up and down, the second female screw member moves up and down integrally with the first female screw member, and rotates integrally with the first male screw member. The second male screw member and the mounting plate are guided by the second guide member to move up and down, and the lifted object mounted on the mounting plate is moved to a predetermined height. That is, since the first male screw member and the second male screw member are formed in a cylindrical shape that can set a large radius (distance from the shaft center) at which the multiple-thread male screw and the multiple-thread female screw are screwed, a solid, small-diameter Compared to lead screw etc., while aiming for weight reduction and simplification of structure,
A stable screw feeding action can be obtained, tilting of the mounting plate, noise, vibration, etc. can be prevented, and a smooth lifting operation can be obtained. Further, the lifting operation can be speeded up without increasing the rotation speed. Further, since the first male screw member and the second male screw member are coaxially arranged in a nested manner, the height of the device (height in the state of being contracted to the lowered position) can be reduced to achieve miniaturization, The lifting stroke can be set long.

In the above structure, the multiple-thread male screw and the multiple-thread female screw may be formed so as to be engaged with each other with a predetermined gap in the radial direction of the male screw member. According to this configuration, since the multiple-thread male screw and the multiple-thread female screw do not contact each other in the radial direction (direction orthogonal to the vertical direction), it is possible to prevent the force pressing the guide member in the radial direction from acting. As a result, it is possible to prevent sticking or the like from occurring on the sliding surface of the guide member, so that a smooth lifting operation can be obtained.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3
1 shows an embodiment of an elevating device according to the present invention, and FIG. 1 is a longitudinal sectional view showing a state in a contracted descending position,
2 is a vertical cross-sectional view showing a state in an extended and raised position, FIG.
(A), (b) is a top view and a cross-sectional view taken along line A1-A1 in FIG.

As shown in FIGS. 1 to 3, this lifting device includes a disk-shaped base 1 having an opening at the center, and a disk-shaped upper plate having an opening 2a arranged so as to face the base 1. 2, three guide members 3 fixed between the base 1 and the upper plate 2 and extending in the ascending / descending direction Z, a cylindrical cam member 5 supported by the base 1 via a rotary support 4, a cam An annular follower member 6 arranged coaxially with the cam member 5 around the member 5, a disk-shaped mounting plate 8 fixed to the follower member 6 via three support members 7, a cam member 5
Is provided with a driving means 9 for exerting a rotational driving force. Here, by the cam member 5, the follower member 6 (and the cam follower 12 described later), the drive means 9, the guide member 3, and the like,
An elevating mechanism for elevating the placing plate 8 is formed.

At the outer edges of the base 1 and the upper plate 2, as shown in FIGS. 1 and 3 (b), a cylindrical cover 10 is formed so as to surround the inside. Further, between the outer edge portion of the mounting plate 8 and the upper surface of the follower member 6, a cylindrical cover 11 formed so as to surround the inside is provided as shown in FIGS. 1 and 3B. Has been. Then, the cover 11 moves up and down integrally with the follower member 6 in the state of being close to the inner edge of the opening 2a of the upper plate 2, and as shown in FIG. 1, when the mounting plate 8 is in the lowered position, When the cover 11 is nested inside the cover 10 and accommodated therein, and as shown in FIG. 2, the mounting plate 8 is in the raised position, the cover 11 cooperates with the cover 10 to surround the entire interior. It is like this.

As shown in FIGS. 1 and 2, the cam member 5 is supported by a rotary support 4 so as to be rotatable about an axis CL extending in the ascending / descending direction Z, and has a spiral shape on its outer peripheral surface. Is formed with a cam groove 5a. Cam groove 5a
Are formed to have a rectangular cross section. A ring gear 5b is integrally formed at the lower end of the cam member 5. The rotary support 4 is a bearing or the like for rotatably supporting the cam member 5 while positioning it in the thrust direction and the radial direction. Here, the cam member 5
Is formed in a hollow cylindrical shape, the weight can be reduced even if the radius of the outer peripheral surface in which the cam groove 5a is formed is relatively large. Then, for example, various electric cables and dust suction hoses necessary for use in a clean room of a semiconductor manufacturing process can be accommodated in the internal space, and the structure can be simplified.

The follower member 6 is formed in an annular shape so as to surround the cam member 5, is movably in the up-and-down direction Z by the guide member 3 via the bearing bush 3a, and is arranged coaxially with the cam member 5. There is. The inner edge of the follower member 6 is provided with three cam followers 12 arranged at intervals such that the central angle θ around the axis CL is 120 degrees. The cam follower 12 is composed of a cylindrical roller, is inserted into the cam groove 5a of the cam member 5, and is adapted to engage with the upper and lower surfaces (groove side surfaces) of the cam groove 5a to roll.

Here, the cam follower 12 and the cam groove 5a are arranged in the radial direction D of the cam member 5 as shown in FIG. 4 (a).
In (the direction orthogonal to the ascending / descending direction Z), a predetermined gap C
Are arranged so as to be engaged with each other. Predetermined interval C
In the radial direction D orthogonal to the axis CL, the bottom surface of the cam groove 5a and the tip end surface of the cam follower 12 contact each other even when the cam member 5 and the follower member 6 move relative to each other. It is in a state where the dimensions are separated. By providing the gap C in this way, when the cam member 5 is rotationally driven, even if the cam member 5 is slightly deviated in the radial direction D due to the rotational driving force or the like, the deviating behavior is not transmitted to the cam follower 12 and the ascending / descending movement is performed. Only the cam action in direction Z is transmitted.

Therefore, no force is generated to press the guide member 3 in the radial direction D, sticking (gnawing) or the like on the sliding surface can be prevented, and a smooth lifting operation can be obtained.
Further, since the three cam followers 12 are arranged at equal intervals (120 degrees), a uniform lift force due to the cam action acts between the cam member 5 and the follower member 6, and the cam member 5 or the follower member 6 is acted. It is possible to prevent the inclination, deviation, etc. of 6 as much as possible. As a cam follower, see FIG.
As shown in (b), it is also possible to use a cam follower 12 'in the shape of a roller provided with crowning so that the central portion swells. In this case, one-sided contact can be prevented and a certain degree of inclination can be allowed, so that a smoother lifting operation can be obtained.

As shown in FIG. 3 (b), the three support members 7 are arranged at equal intervals such that the central angle θ around the axis CL is 120 degrees, and as shown in FIGS. The mounting plate 8 is fixed to the follower member 6. Since the mounting plate 8 is thus supported by the three support members 7, the mounting plate 8 can be firmly supported and its inclination can be prevented while simplifying the structure. The mounting plate 8 is formed in a disc shape so that the lifted body can be mounted on the upper surface thereof.
It should be noted that the mounting plate 8 is provided with an opening through which an electric wire cable, a dust suction hose and the like are passed, and a supporting member or the like is further provided on the mounting plate 8 so that the lifted body is mounted on the supporting member. You may.

As shown in FIGS. 1, 2 and 3 (a), the driving means 9 is composed of a worm gear 9a meshing with the ring gear 5b of the cam member 5, a motor 9b for rotating the worm gear 9a, and the like. Therefore, the motor 9b
When is rotated, the worm gear 9a is rotated to rotate the ring gear 5b and the cam member 5.

Next, the operation of this lifting device will be described. First, as shown in FIG. 1, from the state where the mounting plate 8 is in the lowered position, the motor 9b rotates and the cam member 5 moves to the RU position.
When it starts rotating in the direction, the cam follower 1 moves in the cam groove 5a.
2 rolls, and the follower member 6 begins to rise while being guided by the guide member 3. At the same time, the mounting plate 8 integrally fixed to the follower member 6 also starts to rise.

In this ascending operation, even if the cam member 5 is displaced due to backlash of the rotary support 4 or the like, the cam groove 5a and the cam follower 12 do not come into contact with each other in the radial direction D. Unreasonable force is the guide member 3
It does not act on. As a result, the follower member 6 does not cause sticking, noise, vibration, etc. on the sliding surface.
(And the mounting plate 8) rises smoothly, and an object to be lifted (not shown)
Is smoothly lifted to the maximum raised position, as shown in FIG.

On the other hand, as shown in FIG. 2, when the mounting plate 8 is at the maximum raised position, the motor 9b rotates in the opposite direction and the cam member 5 starts rotating in the RD direction.
The cam follower 12 rolls in the reverse direction in a, and the follower member 6 begins to descend while being guided by the guide member 3. At the same time, the mounting plate 8 also begins to descend.

In this descending operation, even if the cam member 5 is misaligned due to backlash of the rotary support 4 or the like, the cam groove 5a and the cam follower 12 do not come into contact with each other in the same manner as described above, so that the guide member 3 slides. The follower member 6 (and the mounting plate 8) without causing stick, noise, vibration, etc. on the moving surface.
Smoothly descends to the descending position shown in FIG. As described above, the lifting operation is smoothly performed throughout, and noise, vibration, etc. are suppressed or prevented.

In this embodiment, the cam member 5 is rotated to raise and lower the follower member 6 and the mounting plate 8. However, conversely, the mounting plate 8 is fixed to the cam member 5 and the guide member is used. The cam member 5 and the mounting plate 8 may be moved up and down by movably guiding in the up-and-down direction Z and rotating the follower member 6 by the drive means. Further, although the cam groove 5a is formed on the outer peripheral surface of the cam member 5,
The cam follower may be formed on the inner peripheral surface of the cam member, and the cam follower may be arranged to engage with the cam groove formed on the inner peripheral surface.

FIG. 5 shows another embodiment of the lifting device according to the present invention. In place of the cam member 5, the follower member 6 and the cam follower 12 in the above-mentioned embodiment, a multiple thread male screw is formed. The configuration is the same as that of the above-described embodiment, except that a cylindrical male screw member and an annular female screw member on which multiple threads are formed are adopted.

That is, in this lifting device, a cylindrical male screw member 5'is used instead of the cam member 5 and an annular female screw member 6'is used instead of the follower member 6, and the mounting plate 8 is a supporting member. It is fixed to the female screw member 6 ′ via 7. Similar to the cam member 5, the male screw member 5'is supported by the rotation support 4 so as to be rotatable about an axis CL extending in the up-and-down direction Z, and has multiple threads (here, 3) on its outer peripheral surface. A male thread 5a 'is formed. The male screw 5a 'is formed to have a rectangular cross section (square screw).

Since the male screw member 5'is formed in a hollow cylindrical shape, the radius (distance from the axial center) at which the male screw 5a 'and the female screw 6a' are screwed can be set large.
Compared to solid, small-diameter lead screws, etc., while simplifying the structure, it is possible to obtain a stable screw feed action, prevent tilting of the mounting plate 8, noise, vibration, etc., and smooth lifting operation. Is obtained. Further, since it is hollow, the weight can be reduced even if the radius of the outer peripheral surface on which the male screw 5a 'is formed is relatively large. Then, for example, various electric cables and dust suction hoses necessary for use in a clean room of a semiconductor manufacturing process can be accommodated in the internal space, and the structure can be simplified.

The female screw member 6'is formed in an annular shape so as to surround the male screw member 5 ', is movable in the up-and-down direction Z by the guide member 3, and is arranged coaxially with the male screw member 5'. Multiple threads (here, three threads) female threads 6a 'are formed on the inner edge portion of the female thread member 6'. The female screw 6a 'is formed so as to have a rectangular cross section (a square screw).

Here, as shown in FIG. 5, the female screw 6a 'and the male screw 5a' are engaged with each other with a predetermined gap C in the radial direction D of the male screw member 5 '(direction orthogonal to the ascending / descending direction Z). It is arranged to meet. Similarly to the above, the predetermined interval C means that in the radial direction D orthogonal to the axial center CL, even when a relative movement occurs between the male screw member 5 ′ and the female screw member 6 ′, the crest of the male screw 5a ′. And the valleys and the valleys and peaks of the internal thread 6a 'are separated from each other by a dimension such that they do not come into contact with each other. By providing the gap C in this way, the male screw member 5
When ′ ′ is rotationally driven, even if it is slightly biased in the radial direction D due to the rotational driving force or the like, the biasing behavior is not transmitted to the female screw member 6 ′, and only the screw feeding action in the vertical direction Z is transmitted. To be done. Therefore, similarly to the above, the force pressing the guide member 3 in the radial direction D is not generated, and it is possible to prevent sticks (gnails) and the like from being generated on the sliding surface of the guide member 3 and to perform a smooth lifting operation. can get.

The operation of this elevating device is basically the same as that of the above-mentioned device, but a multi-start screw (multi-start male screw 5a) is used.
', Multi-thread female screw 6a')
The elevating operation can be speeded up without increasing the rotation speed of b. That is, when the male screw member 5'formed with the multi-threaded male screw 5a around which N threads are wound makes one revolution,
For the distance (lead) L that the screw thread travels, set the pitch of the screw thread to P
Then, L = N × P. Therefore, it is possible to obtain an ascending / descending speed N times (three times in the case of a triple thread) as compared with the case of the single thread. As a result, the raising / lowering operation can be speeded up without increasing the rotation speed of the motor 9b, and the vibration, noise, etc. associated with the rotational driving force can be suppressed or prevented.

6 to 9 show another embodiment of the lifting device according to the present invention. FIG. 6 is a longitudinal sectional view showing a state in which the lifting device is in a contracted lowered position, and FIG. 7 is an extended raised position. 8 is a vertical cross-sectional view showing the state of FIG. 8, FIGS. 8A and 8B are plan views, and a cross-sectional view taken along line A2-A2 in FIG.
7A and 7B are cross-sectional views taken along lines A3-A3 and A4-A4 in FIG. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 6 to 9, this lifting device has a disk-shaped base 1 having an opening at the center thereof, and a disk-shaped upper plate having an opening 2a disposed so as to face the base 1. 2, three first guide members 3 fixed between the base 1 and the upper plate 2 and extending in the ascending / descending direction Z, and a cylindrical first cam supported by the base 1 via a rotary support 4. Member 5,
An annular first follower member 6 arranged coaxially with the first cam member 5 around the first cam member 5, and an annular movable member fixed to the first follower member 6 via three support members 7. The base 20, the annular second follower member 22 rotatably supported inside the movable base 20 via the rotary support 21, the second cam member 23 disposed inside the second follower member 22, and the second follower member 22. Move the cam member 23 up and down Z
The three connecting shafts 25 that restrict the relative rotation of the two second guide members 24, the second follower member 22, and the first cam member 5 so that they rotate integrally with each other, and connect the two. Drive means 9 for exerting a rotational drive force on the first cam member 5 are provided.

Here, the first cam member 5, the first follower member 6 (and the first cam follower 12), the second follower member 22 (and the second cam follower 28 described later), the second cam member 23, the driving means 9, The first guide member 3, the second guide member 24, and the like form an elevating mechanism for elevating the placing plate 8.

An annular upper plate 5c is fixed to the upper end of the first cam member 5, as shown in FIGS. 7 and 9A. The upper plate 5c is provided with an opening 5c 'so that the second cam member 23 can pass through the opening 5c'. Further, the upper plate 5c has a central angle θ around the axis CL.
The three bearing bushes 25a are arranged at intervals of 120 degrees. The three connecting shafts 25 are guided by the bearing bush 25a so as to be movable in the vertical direction Z.

The lower ends of the three connecting shafts 25 are fixed to the ring member 26, and the upper ends thereof are fixed to the lower surface of the second follower member 22. That is, the three connecting shafts 25 connect the second follower member 22 so as to rotate integrally with the first cam member 5 by restricting the free rotation of the second follower member 22, and move the second follower member 22 in the vertical direction Z. Guide freely.

The second cam member 23 has a structure similar to that shown in FIGS.
As shown in (b), it is arranged coaxially inside the first cam member 5 so as to be retractable in the ascending / descending direction Z, and a spiral second cam groove 23a is formed on the outer peripheral surface thereof.
The second cam groove 23a is formed to have a rectangular cross section. The upper end of the second cam member 23 is fixed to the mounting plate 8. Here, since the second cam member 23 is formed in a hollow cylindrical shape, the weight can be reduced even if the radius of the outer peripheral surface in which the second cam groove 23a is formed is relatively large. Then, for example, various electric cables and dust suction hoses necessary for use in a clean room of a semiconductor manufacturing process can be accommodated in the internal space, and the structure can be simplified.

As shown in FIGS. 7 and 9B, the movable base 20 is formed in an annular shape having an outer diameter smaller than that of the cylindrical cover 11 'fixed to the upper surface of the first follower member 6. In the area located around the first cam member 5, the central angle θ about the axis CL is 3 at intervals of 120 degrees.
One bearing bush 24a is arranged. And 3
The two second guide members 24 are guided by the bearing bush 24a and are movable in the up-and-down direction Z.

As shown in FIGS. 6 and 7, the lower ends of the three second guide members 24 are fixed to the ring member 27 having an inner diameter larger than that of the first cam member 5, and the upper ends thereof are placed. It is fixed to the lower surface of the plate 8. That is, the second guide member 24 guides the mounting plate 8 and the second cam member 23 in the up-and-down direction Z. As shown in FIGS. 6 and 7, a cylindrical cover 29 is fixed to the outer edge portion of the mounting plate 8 so that the mounting plate 8 can be retracted from the cover 11 '. That is, the cover 29 and the cover 11 ′ are formed so as to cooperate with each other to surround the inside of the mounting plate 8 in the raised state.

As shown in FIGS. 6, 7 and 9B, the second follower member 22 is formed in an annular shape so as to surround the second cam member 23, and via the rotary support body 21,
It is rotatably supported by the movable base 20. The second follower member 22 is arranged so as to be movable in the up-and-down direction Z and coaxial with the second cam member 23 by the connecting shaft 25 and the first guide member 3. The rotary support 21 is, for example, a bearing that rotatably supports the second follower member 22 while positioning the second follower member 22 in the thrust direction and the radial direction. At the inner edge of the second follower member 22, as shown in FIG. 9B, the central angle θ around the axis CL is 12
Three second cam followers 2 arranged at intervals of 0 degree
8 are provided. The three second cam followers 28 are
It is composed of a cylindrical roller, is inserted into the second cam groove 23a of the second cam member 23, and is adapted to roll by engaging with the upper and lower surfaces (groove side surfaces) of the second cam groove 23a.

Here, the second cam follower 28 and the second cam groove 23a are arranged in the radial direction D of the second cam member 23 (direction orthogonal to the ascending / descending direction Z) as in the case shown in FIG. It is arranged so as to be engaged with a predetermined gap C. The predetermined interval C is the second cam member 23 and the second follower member 22 in the radial direction D orthogonal to the axis CL.
Even if a relative movement occurs between the second cam groove 2 and
The bottom surface of the groove 3a and the tip end surface of the second cam follower 28 are separated from each other by a dimension such that they do not contact each other. By providing the gap C in this way, when the second follower member 22 rotates, even if the second follower member 22 is slightly biased in the radial direction D due to the transmission form of the rotational drive force, the biasing behavior is It is not transmitted to the 2 cam member 23, but only the cam action in the up-and-down direction Z is transmitted.

Therefore, no pressing force is generated between the second guide member 24 and the bearing bush 24a, and it is possible to prevent a stick (galling) from occurring on the sliding surface of the second guide member 24. A smooth lifting operation can be obtained. Further, the three second cam followers 28 are equally spaced (120 degrees).
Since a uniform lift force is applied between the second cam member 23 and the second follower member 22 due to the cam action, the second cam member 23 or the second follower member 22 is tilted or biased. Etc. can be prevented as much as possible. still,
As the second cam follower 28, as shown in FIG. 4B, the second cam follower 28 may be formed as a barrel-shaped roller provided with crowning so that the central portion swells. In this case, it is possible to prevent one-sided contact and allow a certain degree of inclination,
A smoother lifting operation can be obtained.

Next, the operation of this lifting device will be described. First, as shown in FIG. 6, when the mounting plate 8 is in the lowered position, the motor 9b rotates and the first cam member 5 starts rotating in the RU direction. The first cam follower 12 rolls, and the first follower member 6 moves to the first
It starts to rise while being guided by the guide member 3. At the same time
Movable base 2 integrally fixed to the first follower member 6
0 and the second follower member 22 rotatably supported by the movable base 20 also starts to rise.

Further, as the first cam member 5 rotates,
The second follower member 22 also starts to rotate integrally in the same direction RU. The rotation of the second follower member 22 causes the second cam follower 28 to roll in the second cam groove 23a, and the second cam member 23 starts to move up while being guided by the second guide member 24. At the same time, the mounting plate 8 integrally fixed to the second cam member 23 also starts to rise.

In this ascending operation, even if the first cam member 5 is misaligned due to backlash of the rotary support 4 or the like, the first cam groove 5a and the first cam follower 12 do not come into contact with each other in the radial direction D. Therefore, an unreasonable force does not act on the first guide member 3 in the radial direction D. Also, the second
Even if the follower member 22 and the second cam member 23 are relatively misaligned with each other, the second cam groove 23a and the second cam follower 28 do not come into contact with each other in the radial direction D, so that an unreasonable force is applied in the radial direction D. It does not act on the second guide member 24. As a result, sticking on the sliding surface,
The first follower member 6 and the second follower member 22 and the mounting plate 8 are smoothly raised without inviting noise and vibration,
The lifted body (not shown) is smoothly lifted to the maximum lifted position as shown in FIG. 7.

On the other hand, as shown in FIG. 7, when the mounting plate 8 is at the maximum raised position, the motor 9b rotates in the opposite direction and the first cam member 5 starts rotating in the RD direction. 1
The first cam follower 12 rolls in the opposite direction in the cam groove 5a, and the first follower member 6 begins to descend while being guided by the first guide member 3. At the same time, the movable base 20 integrally fixed to the first follower member 6 and the second follower member 22 rotatably supported by the movable base 20 also start descending.

Further, as the first cam member 5 rotates in the opposite direction, the second follower member 22 also integrally moves in the same direction RD.
Begins to rotate to. By the rotation of the second follower member 22,
The second cam follower 28 rolls in the second cam groove 23a, and the second cam member 23 begins to descend while being guided by the second guide member 24. At the same time, the mounting plate 8 integrally fixed to the second cam member 23 also starts to descend.

In this descending operation, even if the first cam member 5 is misaligned due to backlash of the rotary support 4 or the like, the first cam groove 5a and the first cam follower 12 do not come into contact with each other in the radial direction D. Therefore, an unreasonable force does not act on the first guide member 3 in the radial direction D, and even if the second follower member 22 and the second cam member 23 are relatively misaligned with each other in the radial direction, Since the second cam groove 23a and the second cam follower 28 do not come into contact with each other at D, an unreasonable force does not act on the second guide member 24 in the radial direction D. ), The first follower member 6, the second follower member 22, and the mounting plate 8 smoothly descend to the descending position shown in FIG. 6 without causing noise, vibration, or the like.

As described above, the lifting and lowering operation is smoothly performed throughout, and noise, vibration, etc. are suppressed or prevented.
Further, by disposing the second cam member 23 so as to be retractable in a telescopic manner with respect to the first cam member 5, as shown in FIG. 6, while reducing the height of the device in the lowered position (stored state), As shown in FIG. 7, the maximum rising position can be set higher (that is, the lifting stroke can be set longer).

Further, as another embodiment, in the embodiment shown in FIG. 6 to FIG. 9, it is possible to adopt a structure having a multiple thread male screw and a multiple thread female screw as shown in FIG. That is, in place of the above-mentioned first cam member 5, a first male screw member 5'having a first multi-thread male screw 5a 'formed on the outer peripheral surface thereof.
In place of the second cam member 23, a second male screw member 23 ′ having a second multi-thread male screw 23 a ′ formed on the outer peripheral surface thereof is adopted, and the first follower member 6 and the first cam follower 12 are replaced by a second male screw member 23 ′. The first female thread member 6 ′ provided with the first multiple thread female screw 6a ′ screwed with the one multiple thread male screw 5a ′ is adopted.
The follower member 22 may be replaced with a second female screw member 22 'provided with a second multiple female screw 22a' screwed with the second male screw 23a '. Since the configurations of the male screw and the female screw are substantially the same as those shown in FIG. 5, description thereof will be omitted here.

According to this embodiment, the height of the device can be set shorter and the lifting stroke can be set longer, and the lifting operation can be speeded up without increasing the rotation speed of the motor 9b. It is possible to further suppress or prevent accompanying vibration and noise.

In the above-described embodiments, an electric gear drive mechanism is shown as the drive means.
By providing a handle protruding outside without providing b, and manually rotating the handle, the worm gear 9
It is also possible to rotate a and apply a rotational driving force to the cam member (first cam member) 5. Further, as another driving means, a structure in which the worm gear 9a and the motor 9b are not provided and the cam member (first cam member) 5 is directly driven by a direct motor may be adopted. Furthermore, although the two-stage configuration of the first cam member 5 and the second cam member 23 is shown,
You may employ | adopt the structure which arrange | positioned the cam member which consists of a larger number of steps in a nest shape. It should be noted that although the case where three cam followers 12 and 28 are provided is shown, the present invention is not limited to this.

[0056]

As described above, according to the lifting device of the present invention, the lifting mechanism has the cam member having the cylindrical cam member and the cam follower having the spiral cam groove on the outer peripheral surface or the inner peripheral surface. Since a follower member arranged coaxially with is provided as a basic configuration, the radius (distance from the shaft center) at which the cam groove and the cam follower engage can be set to a large value, and compared to a solid small lead screw, etc. It is possible to suppress or prevent noise, vibration, and the like, while achieving weight reduction and simplification of the structure, and obtain a smooth lifting operation. According to the elevating device of the present invention, the elevating mechanism includes a cylindrical male screw member having a multi-threaded male screw formed on the outer peripheral surface thereof and an annular female screw member provided with the multi-threaded female screw screwed with the multi-threaded male screw. Since it is provided as a basic configuration, the radius (distance from the shaft center) at which the multiple-thread male screw and the multiple-thread female screw are screwed can be set to a large value, making it lighter and more lightweight than a solid, small-diameter lead screw or the like. While simplifying, noise, vibration, etc. can be suppressed or prevented, and a smooth lifting operation can be obtained. In addition, since the lead is enlarged by adopting the multi-start screw (multi-start male screw and multi-start female screw), the lifting operation can be speeded up without increasing the rotation speed of the driving means.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a lifting device according to the present invention, showing a state in which a mounting plate is in a lowered position.

FIG. 2 shows an embodiment of a lifting device according to the present invention, and is a vertical cross-sectional view showing a state in which a mounting plate is in a raised position.

3 (a) is a plan view of the lifting device shown in FIG.
(B) is a cross-sectional view taken along line A1-A1 in FIG.

FIG. 4A is a partial cross-sectional view showing the relationship between the cam groove of the cam member and the cam follower of the follower member in the one embodiment of the lifting device according to the present invention, and FIG. 4B is another embodiment of the cam follower. FIG.

FIG. 5 shows another embodiment of the lifting device according to the present invention, and is a partial cross-sectional view showing a cylindrical male screw member having multiple male threads formed therein and an annular female screw member having multiple female threads formed therein. Is.

FIG. 6 shows another embodiment of the lifting device according to the present invention, and is a vertical cross-sectional view showing a state in which the mounting plate is in the lowered position.

FIG. 7 shows another embodiment of the lifting device according to the present invention, and is a vertical cross-sectional view showing a state in which the mounting plate is in a raised position.

8 (a) is a plan view of the lifting device shown in FIG.
7B is a cross-sectional view taken along line A2-A2 in FIG. 7.

9A is a cross-sectional view taken along line A3-A3 in FIG. 7, and FIG. 9B is a cross-sectional view taken along line A4-A4 in FIG.

[Explanation of symbols]

1 base 3 guide members (first guide member) 4 rotating support 5 Cam member (first cam member) 5'Male screw member 5a Cam groove (first cam groove) 5a 'Multi-thread male thread (1st multi-thread male thread) 6 Follower member (first follower member) 6'female screw member (first female screw member) 6a 'Multiple thread female thread (first multiple thread female thread) 7 Support member 8 Placement plate 9 Drive means 9a Worm gear 9b motor 10, 11, 11 ', 29 cover 12,12 'Cam follower (first cam follower) 20 movable base 21 Rotating support 22 Second follower member 22 'Second female screw member 23 Second Cam Member 23 'Second male screw member 24 Second guide member 25 connecting shaft 26,27 Ring member 28 Second Cam Follower CL axis center Z up and down direction D radial direction

Claims (6)

[Claims] 1. An elevating device comprising a mounting plate for mounting an elevating / lowering body, and an elevating mechanism for elevating the mounting plate, wherein the elevating mechanism has a spiral on an outer peripheral surface or an inner peripheral surface. A cylindrical cam member having a shaft-shaped cam groove and having an axis extending in the up-and-down direction, a follower member provided with a cam follower engaging with the cam groove, and arranged coaxially with the cam member, A driving member that exerts a driving force that rotates one of the cam member and the follower member around the axis, and a guide member that guides the other of the cam member and the follower member in a vertical direction. An elevating device fixed to the other of the cam member and the follower member. 2. A first cam member having a spiral first cam groove formed on an outer peripheral surface thereof and rotatably supported about the axis, and a second spiral member on the outer peripheral surface of the cam member. A second cam member which is formed with a cam groove and is arranged coaxially inside the first cam member so as to be retractable in the vertical direction, wherein the follower member engages with the first cam groove. An annular first follower member provided with a cam follower and capable of ascending and descending, and a second cam follower engaging with the second cam groove are provided, and ascending and descending integrally with the first follower member and with the first cam member. An annular second follower member that rotates integrally; the guide member includes a first guide member that guides the first follower member in a vertical direction and a second guide member that guides the second cam member in a vertical direction. With a guide member Wherein, the mounting plate is fixed to the second cam member, said drive means, said first exerts a rotational driving force to the cam member, the lifting apparatus according to claim 1, wherein a. 3. The cam groove and the cam follower are formed so as to be engaged with each other at a predetermined gap in the radial direction of the cam member, according to claim 1 or 2. lift device. 4. An elevating device comprising a mounting plate for mounting an elevating / lowering body, and an elevating mechanism for elevating the mounting plate, wherein the elevating mechanism has a multi-thread male screw formed on an outer peripheral surface thereof. And a cylindrical male screw member having an axis extending in the ascending and descending direction, an annular female screw member provided with a multiple female thread screwed with the multiple male screw, and one of the male screw member and the female screw member being the shaft. A driving means that exerts a driving force to rotate about the center, and a guide member that guides the other of the male screw member and the female screw member in a vertical direction, and the mounting plate is provided on the other of the male screw member and the female screw member. Lifting device characterized by being fixed. 5. The external thread member has a first outer peripheral surface.
A first male screw member formed with a multi-threaded male screw and rotatably supported about the axis, and a first male screw member coaxially arranged inside the first male screw member so as to be retractable in the ascending and descending direction and a second member on the outer peripheral surface. A second male screw member having a multi-start male screw formed thereon, wherein the female screw member is screwed with the first multi-start male screw.
A first female screw member provided with a multiple-thread female screw and capable of moving up and down, and a second multiple-thread female screw screwed with the second multiple-thread male screw are provided, and the first female screw member moves up and down integrally with the first female screw member and A second female screw member that rotates integrally with the male screw member, wherein the guide member includes a first guide member that guides the first female screw member in a vertical direction and a second guide member that guides the second male screw member in a vertical direction. 5. The elevator according to claim 4, further comprising: two guide members, wherein the mounting plate is fixed to the second male screw member, and the drive unit exerts a rotational driving force on the first male screw member. apparatus. 6. The multi-start male screw and the multi-start female screw,
The lifting device according to claim 4, wherein the male screw member is formed so as to be engaged with a predetermined gap in the radial direction of the male screw member.