Stirring / defoaming device

Abstract

The present invention addresses the problem of providing a stirring / defoaming device with which it is possible to increase the size of a container to be used and to reduce noise while suppressing an increase in the size of the device. As a means for solving the problem, this stirring / defoaming device (1) comprises: a container holder (11) that holds a container (2); a revolving member (12) that supports the container holder (11) such that the container holder is capable of rotating about its own axis, and causes the container holder to revolve; and an inner ring (13) that is disposed so as to surround an outer peripheral part of the container holder (11) in a state in contact therewith. The stirring / defoaming device is disposed such that a contact part (11a) annularly provided on the outer peripheral part of the container holder (11) and a contact surface (13d) provided on the outer peripheral part of the inner ring (13) contact each other. The container holder (11) has a configuration for rotating about its own axis by means of frictional force received from the inner ring (13) while revolving by means of the revolution of the revolving member (12), and further comprises an inner ring rotating means for rotating the inner ring (13), with the axis of rotation being aligned with the central axis of the revolving member (12).

Description

Stirring and Defoaming Device

[0001] The present invention relates to a stirring and defoaming device, and more particularly, to a stirring and defoaming device that includes means for rotating a container both自转 and公转, and rotates the container to perform at least one of stirring and defoaming of a material accommodated in the container.

[0002] Conventionally, a stirring and defoaming device has been put into practical use that includes means for rotating a container both自转 and公转, and performs stirring or defoaming on a single material or a mixed material accommodated in the container. Examples of such materials include single or mixed liquid (including fluids) materials, or mixed materials of liquid materials and powder materials in the fields of pharmaceuticals, chemical materials, food products, paints, semiconductor device materials, etc. (hereinafter simply referred to as "materials").

[0003] Further, in conventional stirring and defoaming devices, when the revolution speed becomes high, the rotation speed further increases accordingly. Particularly in materials with high viscosity, etc., problems such as the material generating heat due to frictional force, shear force, etc. acting on the material and excessive temperature rise have occurred.

[0004] Here, as an example of a conventional stirring and defoaming device, the stirring and defoaming device described in Patent Document 1 has been proposed (see Patent Document 1: JP-A-8-332367). Also, for problems such as material alteration, deterioration, and reduction of the stirring effect, the stirring and defoaming device described in Patent Document 2 has been proposed (see Patent Document 2: JP-A-2021-094512).

[0005] JP-A-8-332367 JP-A-2021-094512

[0006] In the market, there is a need for mass production, and a stirring and defoaming device that can handle large containers is required so that a relatively large amount of material can be stirred and defoamed. On the other hand, in the outer ring rotation type as exemplified in Patent Document 2, when the container is enlarged, the device configuration (particularly, the rotation mechanism of the outer ring) becomes enlarged, resulting in problems such as an increase in the weight and outer shape of the entire device.

[0007] Therefore, the inventor first researched a device using bevel gears without an outer ring. However, conventional devices using bevel gears transmit rotational power through gear meshing, resulting in problems such as high noise levels. For this reason, the inventor researched an inner ring type device that does not use gears.

[0008] The present invention has been made in view of the above circumstances, and aims to provide a stirring and defoaming device that can use larger containers while suppressing an increase in weight and external size by adopting an inner ring type, and that is quieter than conventional gear-type devices by using a gearless power transmission mechanism between the inner ring and the container holder.

[0009] The present invention solves the above problem by the following means.

[0010] This stirring and defoaming apparatus comprises means for rotating a container and means for revolving a container, and performs at least one of stirring and defoaming of a material contained in the container by rotating the container, and includes a plurality of container holders that each hold the container, a revolving member that supports each container holder so as to be able to rotate and is also rotatable around a first rotation axis so as to revolve each container holder around the first rotation axis, a first driving means for rotationally driving the revolving member, an inner ring having a frustoconical disc portion disposed in the center so as to surround all of the outer periphery portions of the container holders in contact with each other, and a sealable structure, at least The invention further comprises a chamber in which the container, the container holder, the orbiting member, and the inner ring are disposed, and a control unit for driving control, wherein the container holder and the inner ring are disposed such that a contact portion provided in an annular shape on the outer circumference of the container holder and a contact surface provided on the outer circumference of the inner ring are in contact, the container holder is configured to revolve around the first rotation axis by the revolving of the orbiting member and to rotate on its own axis by the frictional force received from the inner ring, and an inner ring rotating means for rotating the inner ring by aligning the central axis with the orbiting member.

[0011] Furthermore, it is preferable that the orbiting member comprises a base plate, brackets provided to rise from the base plate at a predetermined angle and to rotatably support each of the container holders, and connecting members that connect opposing brackets.

[0012] Furthermore, it is preferable that the inner ring has a shaft portion to which the second rotation shaft is connected, a disc portion on which the contact surface is formed, and a spacer disposed between the shaft portion and the disc portion, and that the amount of contact between the contact portion on the outer circumference of the container holder and the contact surface of the inner ring can be adjusted by changing the thickness of the spacer.

[0013] Furthermore, it is preferable that the orbiting member has a fixing member that secures the connecting members connected to adjacent brackets together.

[0014] Furthermore, it is preferable that the control unit is configured to control the second driving means to generate a driving force that rotates the inner ring in the same direction as and opposite to the orbital direction of the orbital member, and to control the rotation speed of the inner ring in each direction to be arbitrarily set within a predetermined range.

[0015] According to the present invention, a stirring and defoaming device can be realized that provides both orbital and rotational action of the container, and a configuration in which the inner ring rotates allows both the orbital and rotational speeds to be arbitrarily set. Unlike conventional outer ring rotation type devices, this configuration generates rotational action using an inner ring, so it is possible to use a relatively large container while suppressing an increase in weight and external size compared to conventional devices in which the outer ring is placed outside the orbital part. Furthermore, by using an inner ring type power transmission mechanism that does not use gears to generate the rotational action of the container, it is possible to make it quieter compared to conventional devices that use gears.

[0016] Figure 1 is a perspective view showing an example of a stirring and defoaming apparatus according to an embodiment of the present invention. Figure 2 is a perspective cross-sectional view of the stirring and defoaming apparatus of Figure 1 along line II-II. Figure 3 is a plan view showing an example of the stirring and defoaming apparatus of Figure 1. Figure 4 is a cross-sectional view of the stirring and defoaming apparatus of Figure 3 along line IV-IV. Figure 5 is an enlarged view of section V of Figure 4. Figures 6A and 6B are perspective views showing examples of brackets for the orbiting members of the stirring and defoaming apparatus of Figure 1, where Figure 6A includes a fixing member and Figure 6B does not include a fixing member. Figure 7 is a front view (partial cross-sectional view) showing an example of a container holder for the stirring and defoaming apparatus of Figure 1. Figure 8 is a perspective cross-sectional view showing an example of a container for the stirring and defoaming apparatus of Figure 1.

[0017] Embodiments of the present invention will be described in detail below with reference to the drawings. Figure 1 is a perspective view (schematic diagram) showing an example of a stirring and defoaming device 1 according to an embodiment of the present invention, and Figure 2 is a perspective cross-sectional view (schematic diagram) along line II-II. Figure 3 is a plan view of the stirring and defoaming device 1, and Figure 4 is a front cross-sectional view along line IV-IV. Figure 5 is an enlarged view of section V in Figure 4. Figure 6A is a diagram including the fixing member 8 (shown), and Figure 6B is a diagram without the fixing member 8 (not shown). In all the figures used to explain each embodiment, the same reference numerals are used for members having the same function, and repeated explanations may be omitted. Also, for the sake of simplification of the figures, some bolts and nuts are not shown.

[0018] This stirring and defoaming device 1 is equipped with means for rotating a container 2 and means for revolving a container 2, and is a device for stirring and defoaming (hereinafter simply referred to as "stirring and defoaming") a single material or mixed material contained in the container 2 by rotating and revolving the container 2.

[0019] As shown in Figures 1, 2, and 4, the stirring and defoaming apparatus 1 according to this embodiment comprises a plurality of containers 2 capable of containing various materials to be stirred and defoamed, a plurality of container holders 11 that each hold one of the containers 2, a revolving member 12 that supports each container holder 11 so as to be able to rotate and is rotatably provided around a first rotation axis 16a to cause each container holder 11 to revolve around the first rotation axis 16a, an inner ring 13 having a frustoconical disc portion 13a disposed in the center so as to surround all the outer periphery portions of the container holders 11 in contact with each other, a first driving means (an electric motor in this embodiment) 16 for rotating the revolving member 12, and a control unit (not shown) that controls the driving of the first driving means 16 and a second driving means 18 (described later).

[0020] In this embodiment, a container holder 11, a container 2 held by the container holder 11, a revolving member 12, and an inner ring 13 are arranged inside the chamber 19. Here, the forming materials for these components are not particularly limited to general structural materials made of metal or resin (the same applies to other components). Duralumin is preferably used for the strength members.

[0021] First, the stirring and defoaming device 1 is constructed in a box-like shape with an internal space, enclosed on all four sides by a combination of multiple frames 1a, side panels 1b, and a main body cover 1c, supported at the bottom by a stand 1d, and closed at the top by a cover 1e, the top plate 19a of the chamber 19, and a lid 22. The vacuum pump 10, the first driving means 16, the second driving means 18, and the chamber 19 are arranged to fit within this space.

[0022] The chamber 19 is composed of a top plate portion 19a, an outer cylinder portion 19b, and a bottom portion 19c, with a lid portion 22 provided in the center of the top plate portion 19a. The lid portion 22 is formed to be able to be opened and closed using a roller tightening handle 22a and to be tightly attached to the top plate portion 19a of the chamber 19, thereby creating a structure that allows the inside of the chamber 19 to be sealed. Furthermore, the vacuum pump 10 in the stirring and defoaming device 1 is connected to piping 10a so that the inside of the chamber 19 can be evacuated. The degree of vacuum by the vacuum pump 10 can be set as appropriate, and as an example, the inside of the chamber 19 can be evacuated to atmospheric pressure to about 10 [Pa].

[0023] According to this design, the container 2 can be attached to and detached from the container holder 11 by opening the lid 22. On the other hand, by closing the lid 22, the chamber 19 can be made airtight, and in this state, the container 2 can be rotated and revolved to stir and degass the material inside the container 2. In particular, by creating a vacuum inside the chamber 19 and performing stirring and degassing, the degassing effect can be further enhanced. As an example, the lid 22 is formed using a transparent resin material.

[0024] Next, as shown in Figures 2, 4, and 5, the orbiting member 12 has a base plate 5 to which a first rotation shaft 16a that penetrates the bottom 19c of the chamber 19 is connected. The first rotation shaft 16a is rotatably supported and fixed to the bottom 19c of the chamber 19 via a bearing (for example, a magnetic fluid bearing) 44 that enables vacuum maintenance inside the chamber 19. Here, the shape of the orbiting member 12 can be a disc shape, an arm shape, or a combination thereof. The orbiting member 12 according to this embodiment has a bracket 6 that supports the container holder 11 so that it can rotate at a predetermined inclination angle α with respect to the orbital plane (the orbital axis, i.e., the plane perpendicular to the central axis S of the first rotation shaft 16a). Here, when centrifugal force acts on the container holder 11 (and the container 2) due to rotation (revolution) of the orbiting member 12, the bracket 6 in particular flexes so that it approaches a state parallel to the orbital plane. Therefore, it is preferable to form the orbiting member 12 (especially the bracket 6) using a high-strength, lightweight material such as duralumin. However, it is not limited to this.

[0025] Furthermore, the first rotating shaft 16a and the drive shaft (not shown) of the first driving means 16 are connected via a drive force transmission means. In this embodiment, the drive force transmission means is configured using a first pulley 16b, a second pulley (not shown), and a first transmission member (for example, a timing belt) 16c, but is not limited to this, and may be configured using a chain or the like.

[0026] Furthermore, in this embodiment, four container holders 11 are provided at equal intervals in the circumferential direction (i.e., in a cross shape centered on the first rotation axis 16a) to hold four containers 2, but the invention is not limited to this.

[0027] Here, as shown in Figure 7, the container holder 11 is formed in a bottomed cylindrical shape capable of holding a container 2 inside, and has an annular contact portion 11a on its outer circumference. This contact portion 11a is provided at the radial tip of a flange-shaped member 11b that extends radially from the outer circumference of the container holder 11.

[0028] The contact portion 11a in this embodiment has a concave groove 11d, which has a concave shape in its radial cross-section and is provided in an annular manner along the circumferential direction at the radial tip of the flange-shaped member 11b. Furthermore, a resin elastic ring 11e is fitted into the concave groove 11d as an elastic body for contact. For example, an O-ring made of rubber material (as an example, silicone rubber with a hardness of 50 is preferred) is used as the resin elastic ring 11e, and is fitted into the concave groove 11d while generating a predetermined tension in the direction of diameter reduction in order to suppress the occurrence of slippage, bending, loosening, etc.

[0029] On the other hand, an inner ring 13 having a disc portion 13a for causing rotation of the container holder 11 and a shaft portion 13b connected to the disc portion 13a is disposed in the center surrounded by the container holder 11. The shaft portion 13b is connected to the second rotation axis 18a. More specifically, the disc portion 13a according to this embodiment is formed in a frustoconical shape, as shown in Figures 4 and 5, and its outer circumferential surface is configured as a contact surface 13d. This contact surface 13d is disposed to contact the contact portion 11a (resin elastic ring 11e) of the container holder 11. As an example, the inner ring 13 is formed using stainless steel or the like, but it may also be formed using other metal or resin materials.

[0030] Next, as shown in Figure 8, the container 2 is configured with a bottomed cylindrical body 2b having an opening 2a at the top, and a container lid 2c that fits onto the opening 2a. As an example of use, the material to be stirred and defoamed is placed into the body 2b through the opening 2a with the container lid 2c removed, and then the container lid 2c is fitted and screwed onto the body 2b. In this embodiment, a clean gas filter 2d is provided, but it may be omitted as appropriate. Furthermore, to promote stirring of the material, a convex portion may be provided on the inner wall surface of the body 2b (not shown).

[0031] As shown in Figures 2, 4, and 7, the container 2 is held in the container holder 11 by being inserted into the opening of the container holder 11, which has a cup-shaped top, from the bottom side and fitted into the opening. At this time, the main body portion 2b of the container 2 is fixed by a fastener 11c provided on the container holder 11. This prevents the container 2 from rotating circumferentially relative to the container holder 11 when the container holder 11 rotates (spins on its own axis), and the rotational force of the container holder 11 is transmitted to the container 2, thereby causing the container 2 to rotate (spin on its own axis).

[0032] In this embodiment, the container holder 11 is arranged such that its rotation axis R forms a predetermined inclination angle α with respect to the orbital plane of the orbital member 12 (the upper surface of the base plate 5). As an example, it is set to 40[°] ≤ α ≤ 60[°]. By holding the container 2 in a predetermined angle inclination and performing rotation and revolution in this way, the stirring and defoaming action of the material inside the container 2 can be further enhanced.

[0033] According to the above configuration, the first driving means 16 is activated, and its rotational driving force is transmitted to the first rotating shaft 16a via the driving force transmission means. When the first rotating shaft 16a rotates, the revolving member 12 rotates circumferentially. Therefore, the container holder 11 fixed to the revolving member 12 and the container 2 held in the container holder 11 revolve (orbit) on a constant orbit in the same plane with the central axis S of the first rotating shaft 16a as the center of rotation. Furthermore, when the revolving member 12 revolves, the container holder 11 rotates due to the frictional force generated by the contact between the contact portion 11a (in this case, the resin elastic ring 11e) on the outer circumference of the container holder 11 and the contact surface 13d on the outer circumference of the disc portion 13a of the inner ring 13. Therefore, the container holder 11 and the container 2 held in the container holder 11 revolve and rotate. This makes it possible to effectively stir and degas the material contained in the container 2. The orbital speed and rotational speed are set appropriately depending on the material.

[0034] Furthermore, this embodiment includes an inner ring rotating means. Specifically, the second rotating shaft 18a and the drive shaft (not shown) of the second driving means 18 are connected via a driving force transmission means. In this embodiment, the driving force transmission means is configured using a third pulley 18b, a fourth pulley 18c, and a second transmission member (for example, a timing belt) 18d, but is not limited to this, and may be configured using a chain or the like.

[0035] According to the above configuration, a structure can be realized in which the shaft portion 13b of the inner ring 13 rotates with the central axis S of the orbiting member 12 as the center of rotation. Therefore, a configuration can be realized in which the inner ring 13 rotates while the orbital and rotational actions of the container 2 are obtained as in the conventional method, and both the orbital speed of the orbiting member 12 and the rotational speed of the container 2 can be set arbitrarily.

[0036] Furthermore, the control unit is configured to control the second driving means 18 to generate a driving force that rotates the inner ring 13 in a predetermined direction set from the same direction as the orbital direction of the orbital member 12 and the opposite direction. In addition, the control unit is configured to allow control to arbitrarily set the rotation speed of the inner ring 13 within a predetermined range in both the same direction as the orbital direction and the opposite direction.

[0037] Here, the orbital speed of the orbiting member 12 and the rotational speed of the container 2 are determined by the ratio of the total length of the resin elastic ring 11e of the contact portion 11a of the container holder 11 (i.e., the circumferential length of the contact portion 11a) to the total length of the contact surface 13a of the inner ring 13 (i.e., the circumferential length of the contact surface 13a), when the inner ring 13 is not rotated. Specifically, when the ratio of the total length of the resin elastic ring 11e to the total length of the contact surface 13a is 1:1, the rotational speed is the same as the orbital speed; when it is 2:1, the rotational speed is half the speed of the orbital speed; and when it is 1:2, the rotational speed is twice the speed of the orbital speed.

[0038] Furthermore, the orbital speed of the orbiting member 12 and the rotational speed of the container 2 can be set by the rotation direction and rotational speed of the inner ring 13. As a specific example, if the ratio of the total length of the resin elastic ring 11e to the total length of the contact surface 13a is 1:1, then if the inner ring 13 is rotated in the same direction as the orbital direction and at the same speed as the orbital speed, the rotational speed can be set to zero. On the other hand, if the inner ring 13 is rotated in the opposite direction to the orbital direction and at the same speed as the orbital speed, the rotational speed can be doubled.

[0039] Therefore, the rotation direction and rotation speed of the inner ring 13 can be suitably controlled according to the properties of the material, the required function (stirring, degassing), etc.

[0040] Here, as a result of the inventor's diligent research, it has become clear that the following problems may arise due to the centrifugal force of the revolution acting on the container holder 11. Specifically, when the revolution speed is high, the accompanying centrifugal force causes the bracket 6 supporting the container holder 11 to open outward, and the inclination angle α increases. As a result of this action, the distance between the contact portion 11a on the outer circumference of the container holder 11 and the contact surface 13d on the outer circumference of the disc portion 13a of the inner ring 13 increases, and the frictional force generated by the contact decreases, making slippage more likely.

[0041] To address this issue, in this embodiment, the bracket 6, which is provided to support the container holder 11 rotatably and rises from the orbital plane (upper surface of the base plate 5) of the orbital member 12 at a predetermined angle β (where β = 90° - α), is configured to include a connecting member 7 that connects opposing brackets 6. This makes it possible to fix the brackets 6 together and prevent them from opening due to centrifugal force.

[0042] Furthermore, adjacent connecting members 7 are fixed together by fixing members 8. This provides a strong bond between adjacent brackets 6, suppressing vibrations in the circumferential and vertical directions at each bracket 6 during revolution, and enabling stable rotation (revolution).

[0043] Further, the inner ring 13 is configured to include a disk portion 13a and a shaft portion 13b that transmits a driving force for rotating the inner ring 13 in the same direction and the reverse direction as the revolution direction of the revolving member 12. Furthermore, a spacer 13c is provided between the disk portion 13a and the shaft portion 13b. Thereby, by changing the thickness of the spacer 13c, it becomes possible to adjust the contact amount (contact pressure) between the contact portion 11a on the outer peripheral portion of the container holder 11 and the contact surface 13d on the outer peripheral portion of the disk portion 13a of the inner ring 13. As a specific example, when the thickness of the spacer 13c is increased, it becomes possible to increase the contact amount (contact pressure) between the contact portion 11a on the outer peripheral portion of the container holder 11 and the contact surface 13d on the outer peripheral portion of the disk portion 13a of the inner ring 13, and it becomes possible to solve the problem that slipping easily occurs due to a decrease in frictional force.

[0044] As described above, in the conventional outer ring rotation type device, it is configured to rotate by the frictional force between the contact surface of the outer ring arranged so as to surround the container holder and the contact portion of the container holder. Since the outer ring is rotatably provided outside the container holder, there is a problem that the device configuration (particularly, the rotation mechanism of the outer ring) becomes large-sized, and the weight and outer shape of the entire device become large-sized.

[0045] In order to solve the above problem, in the present embodiment, the container holder 11 is configured to rotate by the frictional force generated by the contact between the contact portion 11a on the outer peripheral portion of the container holder 11 and the contact surface 13d on the outer peripheral portion of the disk portion 13a of the inner ring 13 disposed at the center of the entire container holder 11. Thereby, compared with the conventional device in which the outer ring is disposed so as to surround the entire container holder from the outside, while suppressing an increase in the overall weight and outer shape, the container with respect to the outer shape of the device can be made larger, and it becomes possible to meet the market needs of wanting to use a large container for mass production.

[0046] Further, in the conventional device using a bevel gear, there is a problem that the driving force for rotation is transmitted by the meshing of the gears, and the noise during use is large.

[0047] In order to solve the above problems, in the present embodiment, while adopting an inner ring type, a configuration is adopted in which the driving force is transmitted by surface contact between the contact portion 11a of the container holder 11 and the contact surface 13d on the outer periphery of the disk portion 13a of the inner ring 13. As a result, it is possible to reduce noise. On the other hand, the problem of slip may newly occur due to the transmission structure by surface contact. However, it is possible to prevent slip by providing a configuration such as a connection structure by the connecting member 7, a fixing structure by the fixing member 8, and adjustment of the frictional force by the spacer 13c.

[0048] As described above, according to the stirring and defoaming device according to the present embodiment, the revolving action and the rotating action of the container can be obtained, and a configuration in which the inner ring rotates is realized, and both the revolving speed and the rotating speed can be arbitrarily set. As a result, compared with the conventional outer ring rotation type, the overall configuration of the device does not become large-scale, so that the size of the container can be increased, and a stirring and defoaming device for mass production, which is a market need, can be realized. In addition, with respect to the problem of noise during use in a conventional gear type device, noise reduction can be achieved by adopting an inner ring type in which the driving force is transmitted by surface contact. Also, slip prevention can be achieved at that time.

[0049] Note that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the present invention. For example, a configuration in which characteristic mechanisms (such as a cold air generator and a dry air generator) disclosed in a stirring and defoaming device (Patent No. 5711425) related to the development of the present applicant are appropriately provided in combination may also be adopted.

Claims

1. An stirring and defoaming apparatus comprising means for rotating a container and means for revolving a container, wherein the apparatus rotates the container to perform at least one of stirring and defoaming of a material contained in the container, comprising: a plurality of container holders each holding the containers; a revolving member that supports each container holder so as to be able to rotate and is rotatably provided about a first rotation axis, causing each container holder to revolve around the first rotation axis; a first driving means for rotationally driving the revolving member; an inner ring having a frustoconical disc portion disposed in the center so as to surround all of the outer peripheries of the container holders in contact with each other; a chamber formed to be able to be sealed, in which at least the containers, the container holders, the revolving member, and the inner ring are disposed; and a control unit for driving control, wherein the container holders and the inner ring are disposed such that an annular contact portion provided on the outer periphery of the container holder and a contact surface provided on the outer periphery of the inner ring are in contact with each other. The stirring and defoaming apparatus further comprises: a container holder having a configuration that revolves around the first rotation axis by the revolving member and rotates on its own axis due to the frictional force received from the inner ring, and an inner ring rotating means for rotating the inner ring by aligning the central axis with the revolving member.

2. The stirring and defoaming apparatus according to claim 1, characterized in that the orbiting member comprises a base plate, a bracket provided to rise from the base plate at a predetermined angle and to rotatably support each of the container holders, and a connecting member that connects opposing brackets.

3. The stirring and defoaming apparatus according to claim 1 or 2, wherein the inner ring has a shaft portion to which the second rotating shaft is connected, a disc portion on which the contact surface is formed, and a spacer disposed between the shaft portion and the disc portion, and the amount of contact between the contact portion on the outer circumference of the container holder and the contact surface of the inner ring can be adjusted by changing the thickness of the spacer.

4. The stirring and defoaming apparatus according to claim 2, characterized in that the orbiting member has a fixing member that fixes the connecting members connected to adjacent brackets together.

5. The stirring and defoaming apparatus according to claim 1 or 2, characterized in that the control unit is configured to generate a driving force in the second driving means that rotates the inner ring in the same direction as and opposite to the orbital direction of the orbital member, and is configured to arbitrarily set the rotation speed of the inner ring within a predetermined range in each direction.

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