JP2004290084A - Shaking apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaking apparatus designed to smoothly revolve a shaking table and be quiet in operation. <P>SOLUTION: The shaking apparatus has the following structure and mechanism: The shaking table 3 is revolved about a main shaft subject to rotating drive by a motor via an eccentric shaft eccentrically located relative to the main shaft. In this case, the shaking table 3 is moved along two sliding shafts 43 and 44 rectangular to each other to restrain the autorotation of the table 3. The sliding shafts 43 and 44 are engagedly inserted into a cylindrical long bearings 45 and 46 respectively, the inner circumferential surface of a shaft butt provided close to both ends of the through hole of each of the bearings 45 and 46 is in contact with each of the sliding shafts 43 and 44. The shaft butt has such a construction that the inner circumferential surface of a near-cylindrical back metal part of which is opened slit-fashion is provided with a polyacetal resin thin film layer. In such a construction, as the inner diameter changes little due to temperature rise, the gap between the shaft butt and the outer circumferential surface of each of the sliding shafts 43 and 44 can be narrowed minimally, therefore noise produced by collision of the sliding shafts with the shaft butt can be diminished. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shaking device used for shaking culture, reaction, dissolution, mixing, and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a shaking device that shakes an object under certain conditions has been used when culturing microorganisms such as bacteria, performing a chemical reaction, or dissolving or mixing substances. For example, in a shaking incubator, a culture vessel such as a test tube or a flask containing a liquid medium to which a microorganism sample such as a bacterium to be cultured is attached is fixed to a shaking table, and the shaking table is shaken to the left or right, swirled or rotated. The culture vessel is shaken by rotating or the like. Thereby, the intake of air into the culture container is promoted, and the growth of the microorganism sample is promoted.
[0003]
For example, a shaking device for rotating a shaking table generally rotates a main shaft vertically erected by a driving source such as a motor, and is disposed eccentrically at a predetermined distance from the axis of the main shaft above the main shaft. A configuration is adopted in which an eccentric shaft is eccentrically rotated (revolved) around a main shaft, and a shaking table is turned through the eccentric shaft (for example, see Patent Documents 1 and 2).
[0004]
In addition, when the shaking table revolves around the main axis, a force for rotating the shaking table itself about the eccentric axis acts. Therefore, a rotation restricting mechanism is provided to restrict such rotation. In the prior art described in Patent Literature 1, a subordinate pin is provided above a plurality of vertical subordinate shafts rotatably supported by a base in the same manner as the eccentric amount and the eccentric direction of the eccentric shaft with respect to the main shaft. The subordinate crank mechanism is provided, and the subordinate pin is connected to the shaking table via a connecting member to restrict the rotation of the shaking table. On the other hand, in the prior art described in Patent Document 2, the first bogie supporting the eccentric shaft can be moved linearly in a horizontal plane along the first rail, and the second bogie in which the first rail is installed on the upper surface. The shaking table can be rotated by linearly moving the bogie in a horizontal plane and along a second rail installed in a direction orthogonal to the first rail, and by restricting the movement of the bogie in two axial directions by the first and second bogies. I try not to.
[0005]
[Patent Document 1]
JP-A-10-314568
[Patent Document 2]
JP-A-2002-153742
[0006]
[Problems to be solved by the invention]
However, such a conventionally known rotation control mechanism in a shaking device has a complicated structure, a large number of parts, and it is difficult to reduce the manufacturing cost. In particular, in the prior art described in Patent Document 1, high dimensional accuracy is required for the components constituting the subordinate crank mechanism, so that the cost of each component is high. There is a problem that is bad.
[0007]
Furthermore, it is necessary to appropriately change the turning speed of the shaking table according to the type of the object to be shaken, the purpose of use, and the like. However, when trying to increase the turning speed, the rotation restricting mechanism hinders smooth turning. Often. Also, particularly when the turning speed is high, noise caused by contact or sliding of parts of the rotation restricting mechanism often becomes a problem.
[0008]
The present invention has been made in view of the above point, and a main object of the present invention is to achieve a smooth operation of a shaking table, particularly a smooth turning operation at a high speed, while simplifying the configuration and reducing the cost. Is to provide a shaking device that can be used.
[0009]
[Means for Solving the Problems and Effects]
According to a first aspect of the present invention, there is provided a shaking apparatus for mounting a shaking object on an upper surface, and an eccentric eccentrically arranged with respect to a main shaft rotated and driven by a driving source. An eccentric rotation mechanism for rotating the shaking table around the main shaft via a shaft, and a rotation restricting mechanism for restricting the rotation of the shaking table when the shaking table is rotated by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move, A first sliding shaft or a first bearing and a second sliding shaft or a second bearing which are not fixed to the shaking table and the base are connected to each other;
In the first bearing and / or the second bearing, the shaft contact portion that comes into contact with the first sliding shaft and / or the second sliding shaft has a structure in which a dimensional change due to thermal expansion is small, and the sliding shaft The gap between the outer peripheral surface and the inner periphery of the shaft contact portion is narrowed.
[0010]
In the shaking device according to the first aspect of the invention, when the drive source rotationally drives the main shaft, the shaking table turns (revolves) around the main shaft via the eccentric shaft arranged eccentrically with respect to the main shaft. At this time, first and second sliding shafts that are arranged substantially parallel to the turning surface of the shaking table and substantially orthogonal to each other, and first and second bearings that support these two sliding shafts are provided. As a result, the movement of the shaking table is substantially limited to two axial directions, so that the rotation of the shaking table itself is restricted. According to this configuration, the number of parts constituting the rotation restricting mechanism can be reduced, and the accuracy of each part can be relatively low. Further, the adjustment work of the mounting position at the time of assembly does not require much accuracy. Therefore, the manufacturing cost can be reduced comprehensively.
[0011]
In the shaking device according to the first aspect of the present invention, the shaft contact portion of the first bearing that contacts the first sliding shaft or the shaft contact portion of the second bearing that contacts the second sliding shaft is thermally expanded. And the gap between the outer peripheral surface of the sliding shaft and the inner periphery of the shaft contact portion is set narrow. As a specific embodiment, the shaft contact portions may be formed as a multi-layer or oil-impregnated metal member provided with a resin layer having a small friction coefficient using a back metal as a supporting base.
[0012]
Even if the temperature of the member itself rises due to factors such as the influence of the ambient temperature or the accumulation of frictional heat, the dimensional change due to thermal expansion is small. The gap with the inner circumference can be made very small. As a result, the sliding shaft hardly rattles in the direction crossing the shaft inside the bearing, and when the sliding shaft and the bearing relatively slide, the collision between the sliding shaft and the bearing (shaft contact portion) occurs. The generated noise (so-called slap noise) can be suppressed. Therefore, noise during operation is small, and high quietness can be achieved. In addition, since the sliding operation can be favorably performed even when the temperature is increased, the shaking table can be smoothly swung even under severe use conditions such as continuous operation and high-speed swirling, and a favorable shaking operation can be performed.
[0013]
As a preferred embodiment of the shaking device according to the first invention, the shaft contact portion may be configured as a substantially cylindrical member having a part in the circumferential direction opened in a slit shape in the axial direction.
[0014]
According to this configuration, even when the temperature rise of the shaft contact portion is large and the back metal or the oil-impregnated metal expands thermally, the thermal expansion is absorbed by narrowing the gap between the slit-shaped open portions. Can be minimized. Thereby, a smooth operation of the shaking table can be ensured.
[0015]
Further, in the shaking device according to the first aspect of the present invention, the first bearing and / or the second bearing may be separated from the shaft by a predetermined distance in the axial direction inside a through hole of a bearing holder having a substantially cylindrical through hole. A configuration in which a plurality of contact portions are provided can be employed.
[0016]
According to this configuration, it is possible to reliably hold and slide the sliding shaft while reducing the contact area that actually contacts the sliding shaft. Generally, in the bearing, the shaft contact portion uses a material more expensive than the other portions. However, the area of the shaft contact portion is small, so that the cost required for the bearing can be further reduced.
[0017]
Further, as a specific mode, the shaft contact portion can be configured as a multilayer member in which a polyacetal resin layer is provided on an inner peripheral surface of a back metal. According to this configuration, various effects as described above can be reliably achieved.
[0018]
According to a second aspect of the present invention, there is provided a shaking device for mounting a shaking object on an upper surface and an eccentric arrangement with respect to a main shaft rotated and driven by a driving source. An eccentric rotation mechanism for rotating the shaking table around the main shaft via the eccentric shaft, and a rotation restricting mechanism for restricting the rotation of the shaking table when the shaking table is rotated by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move. The other of the first sliding shaft or the first bearing and the other of the second sliding shaft or the second bearing that are fixed and are not fixed to the shaking table and the base are connected to each other,
The first bearing and / or the second bearing includes a bearing holder having a substantially cylindrical through hole, and a sliding shaft that is inside the through hole of the bearing holder and is inserted through the through hole. A plurality of shaft contact members urged so as to press in the direction of the central axis from the bearing shaft, and the sliding shaft is held inside the through hole of the bearing holder by the balance of the pressing force by the plurality of shaft contact members. It is characterized by being.
[0019]
As one mode of the shaking device according to the second invention, the shaft contact member is a cylindrical body, and is disposed in a gap between an outer peripheral surface of the shaft contact member and an inner peripheral surface of a through hole of the bearing holder. The sliding shaft may be configured to be pressed from the outer peripheral side toward the center axis by the elastic member through the shaft contact member.
[0020]
Further, as another aspect of the shaking device according to the second invention, the shaft contact member comes into contact with both the inner peripheral surface of the bearing holder and the outer peripheral surface of the sliding shaft, and the elastic member itself generates elastic force. The sliding shaft can be configured to be pressed from its outer peripheral side toward the central axis by its elastic force.
[0021]
In the shaking device according to the second invention, similarly to the shaking device according to the first invention, the first and second sliding shafts are arranged substantially parallel to the turning surface of the shaking table and substantially orthogonal to each other. The movement of the shaking table is substantially limited to two axial directions by the first and second bearings that support these sliding shafts, thereby restricting the rotation of the shaking table itself. Therefore, also with this configuration, the number of parts constituting the rotation restricting mechanism can be reduced, the precision of each part can be relatively low, and the precision adjustment work at the time of assembly can be reduced, so that the overall structure can be reduced. In addition, the manufacturing cost can be reduced.
[0022]
In the first bearing and / or the second bearing, inside the cylindrical through-hole of the bearing holder, the sliding shaft inserted into the through-hole is urged from the outer peripheral side toward the center axis. The sliding shaft is slidably carried by the plurality of shaft contact members. Therefore, even when the shaft center of the sliding shaft and the shaft center of the bearing holder are shifted from being substantially coincident (or parallel) to cross each other due to an external force, the shaft contact member follows the shift. Therefore, the contact between the sliding shaft and the shaft contact member is maintained. As a result, a collision between the sliding shaft and the shaft contact member hardly occurs, and noise accompanying such a collision hardly occurs. Therefore, high quietness can be achieved. Further, as described above, when the relative positional relationship between the sliding shaft and the bearing holder is tilted, the pressing force of the shaft contact member acts in a direction to correct the tilt, so that a large tilt is unlikely to occur in the first place. Therefore, a smooth sliding operation can be easily performed, and the shaking table can also be smoothly turned.
[0023]
According to a third aspect of the present invention, there is provided a shaking device for mounting a shaking target on an upper surface and an eccentric arrangement with respect to a main shaft rotated and driven by a driving source. An eccentric rotation mechanism for rotating the shaking table around the main shaft via the eccentric shaft, and a rotation restricting mechanism for restricting the rotation of the shaking table when the shaking table is rotated by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move. The other of the first sliding shaft or the first bearing and the other of the second sliding shaft or the second bearing that are fixed and are not fixed to the shaking table and the base are connected to each other,
In the first bearing and / or the second bearing, a large number of small-diameter balls are rotatably held by a ball retainer at a shaft contact portion that comes into contact with the first sliding shaft and / or the second sliding shaft. It is a ball guide.
[0024]
In the shaking device according to the third aspect of the invention, since the ball guide, which is a shaft contact portion, is inserted into the gap between the bearing holder and the sliding shaft by a preload fitting, there is no backlash, and the ball guide is used when the sliding shaft operates. Has a very small frictional resistance because it rolls on both the sliding shaft and the bearing holder. Therefore, the sliding shaft slides smoothly, and noise can be suppressed as compared with a ball bearing or the like.
[0025]
According to a fourth aspect of the present invention, there is provided a shaking device for mounting a shaking target on an upper surface and an eccentric arrangement with respect to a main shaft rotated and driven by a driving source. An eccentric rotation mechanism for rotating the shaking table around the main shaft via the eccentric shaft, and a rotation restricting mechanism for restricting the rotation of the shaking table when the shaking table is rotated by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move. The other of the first sliding shaft or the first bearing and the other of the second sliding shaft or the second bearing that are fixed and are not fixed to the shaking table and the base are connected to each other,
In the first bearing and / or the second bearing, the length between both ends of the shaft contact portion that comes into contact with the first sliding shaft and / or the second sliding shaft is one of the length of the sliding shaft. / 2 is set longer.
[0026]
Here, when the bearing is configured to have only one shaft contact portion on the inner periphery of the bearing holder, the “length between both ends of the shaft contact portion” is the length of the entire shaft contact portion. In the case where the bearing has a configuration in which a plurality of shaft contact portions are separated in the axial direction on the inner periphery of the bearing holder, the “length between both ends of the shaft contact portion” is the both ends of the bearing holder. The distance between the outer ends of each of the two shaft contact portions which are respectively closest to the shaft contact portion.
[0027]
According to this configuration, the sliding shaft can be stably held by the shaft contact portion provided on the inner peripheral side of the bearing holder, so that rattling during the sliding operation is suppressed, and a smooth and low-noise sliding is achieved. It is effective to make the action. Further, since an unreasonable load is hardly applied to the sliding shaft and the shaft contact portion, the occurrence of failure can be reduced.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a shaking device according to an embodiment of the first invention (hereinafter, referred to as a first embodiment) will be described with reference to FIGS. FIG. 1 is a perspective view showing the appearance of a shaking device 1 according to a first embodiment, FIG. 2 is a perspective view of the shaking device 1 with an outer case 2 removed, FIG. 3 is a front view showing the appearance of the shaking device 1, and FIG. FIG. 5 is a front vertical cross-sectional view of a main part of the shaking device 1, FIG. 6 is a top plan view (a) and a side plan view (b) of a connecting member of the shaking device 1. 7 is a schematic cross-sectional view of a bearing in the shaking device 1, and FIG. 8 is a vertical cross-sectional view of a shaft contact portion in FIG.
[0029]
In the shaking apparatus 1 of the first embodiment, as shown in FIG. 1, a flat shaking table 3 is provided on an upper surface of an outer case 2 having an open upper surface and a lower surface, and a diagonally upward direction is provided on an upper front surface. An operation panel 4 is provided for setting a turning speed, a shaking operation time, and the like. Further, a plurality of (four in this embodiment) vibration-proof legs made of an elastic member such as rubber protrude from an opening on the lower surface of the outer case 2. We support standing up.
[0030]
As shown in FIGS. 2 to 5, an eccentric rotation mechanism 6 and an eccentric rotation mechanism 6 are provided on an upper surface of a base 10 as a configuration of a mechanical system for rotating the shaking table 3 in the shaking apparatus 1. A drive mechanism 7 including a driving motor 21 and a rotation restricting mechanism 8 for restricting rotation of the shaking table 3 are provided. Hereinafter, the configuration of each of these mechanisms will be described in detail.
[0031]
The base 10 has a horizontal fixed base 11 having the above-described four legs 5 on the bottom surface, and the fixed base 11 above the fixed base 11 via a plurality of spring-shaped vibration isolating members 13. And a support base 12 mounted in parallel. In addition, the base 10 may be configured only from the fixed base 11 without using the vibration isolating member 13, but the configuration according to the present embodiment can achieve a higher vibration isolating effect.
[0032]
As the drive mechanism 7, a motor 21 is fixed to the right rear of the upper surface of the support base 12 via a motor mount 20 with its rotating shaft directed vertically downward. A small pulley 22 is fixed to a rotation shaft of the motor 21, and a timing belt 23 is wound around a large pulley 33 described later. On the other hand, as the eccentric rotation mechanism 6, a fixed shaft 30 is erected in the vertical direction substantially at the center of the support base 12, and the main shaft 32 is rotatably mounted on the fixed shaft 30 via a ball bearing 31. Is attached. Therefore, the center of rotation of the main housing 32 is the fixed shaft body 30, and the main housing 32 actually rotates as the main shaft. The above-described large pulley 33 is fixed to the outer peripheral side of the lower portion of the main housing 32. When the motor 21 is driven, the main housing 32 rotates around the fixed shaft 30 via the small pulley 22, the timing belt 23, and the large pulley 33.
[0033]
The main housing 32 is connected to an eccentric housing 35 via a connecting member 34 mounted thereon. An eccentric shaft 37 extending in the vertical direction is rotatably provided on the inner peripheral side of the eccentric housing 35 via a ball bearing 36. The eccentric shaft 37 is connected to a shaking table via a hub 38 and a connecting plate 42 described later. 3 is fixed to the back surface.
[0034]
As shown in FIGS. 6A and 6B, the connecting member 34 includes a disk body 60 having a circular opening 61 at the center and a mounting member 65 having a balance weight 66 screwed to an end. Have. A plurality of main housing side fixing holes 62 for screwing into a fixing hole (not shown) formed in the large pulley 33 through the main housing 32 in the disk body portion 60 and an eccentric housing 35 are formed. Two positioning holes 63 for defining the mounting position by matching the mounting holes for positioning, and a plurality of screws for screwing into holes (not shown) formed in the lower end flange 35a of the eccentric housing 35. An eccentric housing side fixing hole 64 is provided. An arc-shaped notch 61a is formed in the circular opening 61 at a position just opposite to the balance weight 66 so as not to hinder the rotation of the eccentric shaft 37 as described later.
[0035]
The procedure for attaching the connecting member 34 is as follows. First, the main housing side fixing hole 62 of the connecting member 34 is aligned with the fixing hole of the large pulley 33 in the same position in the vertical direction, and both are fixed by the long screw 39. Next, the eccentric housing 35 with the eccentric shaft 37 mounted thereon is placed on the connecting member 34, and two positioning holes on the eccentric housing 35 side and two positioning holes 63 of the connecting member 34 are formed. And a pin 40 having a substantially cylindrical shape is inserted from above to fix the position. After that, the fixing hole formed in the lower end flange 35a of the eccentric housing 35 and the eccentric housing side fixing hole 64 of the connecting member 34 are aligned with each other and fixed with a screw (not shown).
[0036]
Thereby, the eccentric shaft 37 is eccentric with respect to the fixed shaft 30 by a predetermined amount, specifically, as shown in FIG. The axis Cu of the eccentric shaft 37 is located at the shifted position, and the eccentric housing 35 is rotatable around the eccentric shaft 37.
[0037]
As described above, the connecting plate 42 connecting the hub 38 and the shaking table 3 has a function of connecting the eccentric rotation mechanism 6 and the rotation restricting mechanism 8. The rotation restricting mechanism 8 includes a first sliding shaft 43 and a second sliding shaft 44 extending in a direction orthogonal to the first sliding shaft 43. Each of the first sliding shaft 43 and the second sliding shaft 44 is a long columnar body of a column or a cylinder made of metal such as steel or aluminum, or ceramic.
[0038]
The first sliding shaft 43 is on the opposite side of the fixed shaft body 30 from the drive mechanism 7, and extends in the front-rear direction substantially in parallel with the turning surface of the shaking table 3, and both ends thereof are under the connecting plate 42. And is fixed to a fixing piece 42a which protrudes and is attached to the fixing member 42a. The first sliding shaft 43 is inserted into a through hole of a cylindrical first bearing 45 described later in detail, and is slidable in the axial direction inside the through hole of the bearing 45. In addition, fixing portions 45 a formed integrally at both ends of the first bearing 45 are fixed to the connecting plate 47.
[0039]
The second slide shaft 44 is located at the front of the support base 12 and extends in a direction perpendicular to the first slide shaft 43. Both ends of the second slide shaft 44 are screwed to the front part of the support base 12 at predetermined intervals. It is attached to two fixing members 48. The second sliding shaft 44 is inserted into a through hole of a second bearing 46 similar to the first bearing 45, and is slidable in the axial direction inside the through hole of the bearing 46. A flange 46a is formed integrally with the second bearing 46 on the side where the first sliding shaft 43 is provided, and a connecting plate 49 screwed to the flange 46a and the connecting plate 47 are connected. It is fixed to the first bearing 45 via the same. That is, the second bearing 46 and the first bearing 45 are thus connected.
[0040]
As described above, when the eccentric shaft 37 is eccentrically rotated by the rotation drive by the motor 21 and the shaking table 3 rotates eccentrically around the fixed shaft 30 in accordance with this, the first bearing 45 moves with respect to the shaking table 3. The second bearing 46 connected to the first bearing 45 is slidably movable with respect to the first sliding shaft 43 fixed to the support base 12. It slides freely with respect to 44. That is, while the shaking table 3 is slidable on two axes substantially orthogonal to each other in the front-rear direction and the left-right direction of the apparatus, the rotation of the shaking table 3 is restricted, and the shaking table 3 stably pivots in a horizontal plane about the fixed shaft 30. (Orbit).
[0041]
Since the position of the center of gravity of the shaking table 3 and the axis Cm of the fixed shaft 30 which is the center of rotation thereof are horizontally displaced, a centrifugal force acts on the shaking table 3 during the turning motion. Since the balance weight 66 is provided on the opposite side of the shaking table 3, the force of the centrifugal force is generated by the weight of the balance weight 66, thereby preventing the shaker itself from vibrating greatly. I have.
[0042]
Now, when the shaking table 3 rotates eccentrically (revolves), the first sliding shaft 43 and the first bearing 45 and the second sliding shaft 44 and the second bearing 46 can slide with small frictional resistance. Otherwise, it is difficult for the shaking table 3 to perform a smooth turning motion. As a method for reducing the frictional resistance, a portion that is in contact with the sliding shaft on the inner peripheral surface of the bearing is formed of a resin having a low friction coefficient such as a fluororesin such as ethylene tetrafluoride resin. That is. Also, in order to reduce the contact area between the sliding shaft and the inner peripheral surface of the bearing, the inner diameter of the bearing is slightly larger than the outer diameter of the sliding shaft, and only a part of the inner peripheral surface in the circumferential direction is slid. It is also conceivable that the shaft can be slid in the axial direction in a state of contact.
[0043]
However, in the latter case, a gap is formed between the inner peripheral surface of the bearing and the outer peripheral surface of the sliding shaft, so that the sliding shaft and the bearing are in a one-sided contact state, and the abutting portion is formed during the period when the shaking table makes one turn. A collision sound is generated due to the change in Therefore, in the shaking device according to the present embodiment, the first and second shaking devices are designed to reduce the collision noise between the sliding shaft and the bearing while achieving smooth sliding (that is, smooth turning of the shaking table 3). The bearings 45 and 46 have a characteristic configuration. Next, the configuration of this bearing will be described in detail with reference to FIGS. Here, only the second bearing 46 will be described, but the same applies to the first bearing 45.
[0044]
FIG. 7 is a cross-sectional view of a surface including the axis C of the sliding shaft 44 when the second sliding shaft 44 is fitted into the second bearing 46, and FIG. 8 constitutes the second bearing 46. It is a longitudinal cross-sectional view of the shaft contact part 462. As shown in FIG. 7, the second bearing 46 has a configuration in which shaft contact members 462 are respectively provided near both ends inside a through hole of a cylindrical bearing holder 461. Only the inner peripheral surface of the two shaft contact members 462 actually contacts the outer peripheral surface of the second sliding shaft 44.
[0045]
As shown in FIG. 8, in the shaft contact member 462, a friction coefficient is applied to the inner peripheral surface of the back metal 462a which is cylindrically wound so that a part of the circumference of the shaft is opened like a slit (opening 462b). And a thin film 462c of a polyacetal resin having small wear resistance. Specifically, the actual outer diameter of the sliding shaft 44 is 10.082 to 10.09 mm (including tolerance), while the inner diameter of the shaft contact member 462 is about 10.11 mm. Therefore, when the sliding shaft 44 is inserted into the bearing 46, the gap between the outer peripheral surface of the sliding shaft 44 and the inner peripheral surface of the shaft contact member 462 is only about 20 μm, which is very narrow. Accordingly, the sliding shaft 44 hardly rattles in the state of being inserted into the bearing 46. Therefore, even when the shaking table 3 rotates eccentrically, the collision between the sliding shaft 44 and the bearing 46 (shaft contact member 462) occurs. It is difficult, and the noise accompanying it can also be suppressed.
[0046]
Further, in this configuration, the distance L between the outer ends of the two shaft contact members 462 is set to be equal to or more than の of the entire length of the sliding shaft 44. Thereby, the sliding shaft 44 is stably held even during the sliding operation, so that the backlash can be further reduced. Further, since an excessive load is hardly applied to the sliding shaft 44 and the bearing holder 461 during the sliding operation, it is possible to reduce the occurrence of problems such as bending and breakage.
[0047]
According to the experiment of the inventor of the present application, when a molded product made of fluororesin is used as the shaft contact member, the inner diameter is set to about 10.11 mm, and the sliding shaft diameter is set to 9.986 to 9.995 mm, the noise level is reduced. The equivalent average was about 50 dB. However, since this noise is intermittent, it is very unpleasant and unpleasant even though the sound pressure is relatively small. On the other hand, when the configuration in which the shaft contact portion 462 and the sliding shaft 44 are combined as described above is employed, the equivalent average of the noise level is reduced by about 10 dB to about 40 dB under the same shaking condition, and actually, A great quiet effect was also confirmed in terms of hearing.
[0048]
Further, when the present device is used in an environment where the ambient temperature is extremely high, or when the temperature of the bearing increases due to frictional heat during continuous operation for a long time, the back metal 462a of the shaft contact portion 462 thermally expands. Most of the expansion is absorbed by the narrowing of the opening 462b, so that the inner diameter of the shaft contact portion 462 hardly changes. Therefore, as described above, the gap between the sliding shaft 44 and the shaft contact portion 462 is very narrow, but the gap does not become narrower even when the temperature rises, and a stable sliding resistance can always be maintained. Thereby, even under relatively harsh use environment conditions such as high temperature or continuous use for a long time, a smooth turning operation of the shaking table 3 can be ensured, and abnormal wear of the shaft contact member 462 hardly occurs. Less failures.
[0049]
In the first embodiment, the configuration of the shaft contact member 462 of the bearing 46 is not limited to that described above. For example, in addition to the combination of the back metal and the polyacetal resin thin film, the combination of the back metal and another resin thin film (for example, an ethylene tetrafluoride resin, an oil-containing polyamide resin, an oil-containing polyolefin resin, etc.), and an oil-containing sintered metal. Good.
[0050]
Next, an embodiment of the shaking device according to the second invention (hereinafter, referred to as a second embodiment) will be described. The only difference from the first embodiment is the internal structure of the bearing, and only this point will be described with reference to FIG. FIG. 9A is a cross-sectional view (horizontal direction) of the shaking device according to the second embodiment in a state where the sliding shaft 44 is inserted into the bearing 76A, and FIG. 9B is a diagram in FIG. 3 is a sectional view taken along line AA ′ of FIG.
[0051]
In the bearing 76A, three shaft contact members 762 and 763 are provided inside a through hole of a substantially cylindrical bearing holder 761. The shaft contact members 762 and 763 are cylindrical bodies made of, for example, a resin such as ethylene tetrafluoride, and are carried inside the through holes of the bearing holder 761 via springs and other elastic members. In this embodiment, three shaft contact members 762 and 763 are a first group to which two shaft contact members 762 located near both ends belong, and a second group to which one shaft contact member 763 sandwiched between the two members. 9B, the shaft contact member 762 belonging to the first group is pressed rightward perpendicular to the sliding shaft 44 by a force obtained by combining the biasing forces of the two elastic members 762a on the left side in FIG. 9B. ing.
[0052]
In addition, the right elastic member 762 b assists the leftward biasing force to the shaft contact member 762 so that the shaft contact member 762 does not collide with the inner peripheral surface of the through hole of the bearing holder 761. On the other hand, the shaft contact member 763 belonging to the second group has a configuration axially symmetric with the shaft contact member 762 with the axis C interposed therebetween, and is pressed to the left orthogonal to the sliding shaft 44.
[0053]
Therefore, the sliding shaft 44 comes into contact with the inner peripheral surfaces of the two groups of shaft contact members 762 and 763 that press the sliding shaft 44 in a direction directly opposite to each other with the shaft core C interposed therebetween in a state of single contact. Accordingly, it is carried at substantially the center of the through hole of the bearing holder 761. That is, the axis of the bearing holder 761 and the axis of the sliding shaft 44 are substantially aligned. In this configuration, even when an external force is applied so that the axis of the sliding shaft 44 and the axis of the bearing 76A are not parallel when the shaking table 3 rotates eccentrically (this force is mainly shown in FIG. 9B). ), The shaft contact members 762 and 763 are appropriately moved within a through hole of the bearing holder 761 and in a plane substantially perpendicular to the axis, and always contact with the outer peripheral surface of the sliding shaft 44. Maintain state. Therefore, collision between the sliding shaft 44 and the shaft contact members 762 and 763 is unlikely to occur, and occurrence of abnormal noise due to the collision can be prevented.
[0054]
FIG. 10 is a modification of the second embodiment, and FIG. 10A is a cross-sectional view of the shaking device according to the modification in which the sliding shaft 44 is inserted into the bearing 76B. 10) is a cross-sectional view taken along line BB ′ of FIG.
[0055]
Mounting recesses 761a are formed at predetermined intervals in the axial direction inside the through-holes of the bearing holder 761, and the mounting recesses 761a are formed through elastic members 764 having a wavy cross section having elasticity due to a repulsive force when deformed. The shaft contact members 762 and 763 are held. The four shaft contact members 762 and 763 are divided into two groups in the same manner as in the above example, and are arranged alternately in the axial direction on the left and right in FIG. 10B. Accordingly, the sliding shaft 44 is in contact with the inner peripheral surfaces of the two groups of shaft contact members 762 and 763 that press the sliding shaft 44 in the direction directly opposite to each other with the shaft core C interposed therebetween, in a single contact state. Thereby, it is carried at substantially the center of the through hole of the bearing holder 761.
[0056]
Also in this configuration, even when an external force is applied so that the axis of the sliding shaft 44 and the axis of the bearing 76B are not parallel when the shaking table 3 is eccentrically rotated, the shaft inside the through-hole of the bearing holder 861 remains. The elastic member 764 presses the shaft contact members 762 and 763 while appropriately deforming in a plane substantially perpendicular to the shaft center, so that a part of the inner peripheral surface of the shaft contact members 762 and 763 is always part of the sliding shaft 44. To maintain the one-sided contact with the outer peripheral surface. Therefore, collision between the sliding shaft 44 and the shaft contact members 762 and 763 is unlikely to occur, and occurrence of abnormal noise due to the collision can be prevented.
[0057]
FIG. 11 shows another modification of the second embodiment, and FIG. 11 (a) is a cross-sectional view of the shaking device according to this modification in which the sliding shaft 44 is inserted into the bearing 76C. FIG. 12B is a cross-sectional view taken along line CC ′ of FIG.
[0058]
In the configuration of this modification, a sleeve 765 having a substantially cylindrical shape and having a cutout portion 765a partially cut out at a substantially central portion thereof is fitted around the inner periphery of the bearing holder 761, and furthermore, at both ends of the inner periphery thereof. A substantially cylindrical shaft contact portion 762 is fitted into the portion. On the other hand, a bearing positioning bolt 766a is screwed through the bearing holder 761 at the position of the defective portion 765a, and a shaft contact member 763 is fixed to the tip of the bolt. The position of the bearing positioning bolt 766a is fixed by a nut 766b. When the nut 766b is loosened, the bearing positioning bolt 766a can freely advance and retreat inside the bearing holder 761. That is, in this configuration, the bearing positioning member 766 composed of the bearing positioning bolt 766a and the nut 766b adjusts the position of the shaft contact portion 763 with respect to the shaft center C, and thereby the sliding shaft is moved via the shaft contact members 762 and 763. An appropriate pressing force is applied to 44 to prevent rattling during sliding.
[0059]
As described above, in the bearing configuration according to the second embodiment and its modification, the shaft contact members 762 and 763 apply an appropriate pressing force to the sliding shaft 44 so as not to hinder the sliding. Since the bearing 44 is carried, the bearing and the sliding shaft slide relative to each other without a large deviation of their shaft cores. Accordingly, the shake table smoothly rotates eccentrically. Of course, the present invention can be modified into an appropriate configuration so as to have the same operation other than the embodiment described above.
[0060]
Next, the shaking device according to the third invention will be described. FIGS. 12A and 12B are views showing a state in which a sliding shaft is inserted into a bearing of the shaking device according to the third embodiment of the present invention, wherein FIG. 12A is an external perspective view, and FIG. (C) is a cross-sectional view taken along line DD ′ in (b). In the bearing 86 according to this embodiment, the bearing holder 861 and the sliding shaft 44 are connected via a ball guide 862 including a substantially cylindrical ball retainer 862a and a plurality of small-diameter balls 862b held by the ball retainer 862a. . The ball guide 862 has no backlash because it is inserted into the gap between the bearing holder 861 and the sliding shaft 44 by preload fitting, and is a kind of rolling bearing by rolling of the ball 862b. In this case, the resistance is very small and smooth sliding is achieved. Further, each of the balls 862b is independently held by a ball retainer 862a and rotates at a fixed position independently of the other balls. The noise of the car is quite small.
[0061]
It is to be noted that the above embodiments are merely examples of the present invention, and it is apparent that points other than those described above can be appropriately changed, modified, or added within the spirit of the present invention.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a shaking device according to an embodiment (first embodiment) of the first invention.
FIG. 2 is a perspective view of the shaking device of the first embodiment with an outer case removed.
FIG. 3 is an external front view of the shaking apparatus according to the first embodiment, in which a base except for an outer case and a support is removed.
FIG. 4 is a left side view of the appearance of the shaking device according to the first embodiment.
FIG. 5 is a front vertical sectional view of a main part of the shaking device according to the first embodiment.
FIG. 6 is a top plan view (a) and a side plan view (b) of a connecting member in the shaking apparatus according to the first embodiment.
FIG. 7 is a schematic cross-sectional view of a bearing in the shaking device according to the first embodiment.
FIG. 8 is a sectional view of the shaft contact member in FIG. 7;
FIG. 9A is a cross-sectional view of a bearing in a shaking device according to an embodiment (second embodiment) of the second invention, and a cross-sectional view taken along line AA ′ in FIG. 9A.
10A is a cross-sectional view of a bearing in a shaking device according to a modification of the second embodiment, and FIG. 10A is a cross-sectional view taken along line BB ′ of FIG.
11A is a cross-sectional view of a bearing in a shaking device according to a modification of the second embodiment, and FIG. 11A is a cross-sectional view taken along line CC ′ in FIG. 11A.
FIG. 12 is an external perspective view (a), a cross-sectional view (b), and a cross-sectional view taken along the line DD ′ of FIG. 12 (b) of a bearing in a shaking device according to still another embodiment.
[Explanation of symbols]
1: Shaking device
2: Exterior case
3: Shaking table
5 ... Legs
6. Eccentric rotation mechanism
7. Drive mechanism
8 ... rotation control mechanism
10 ... Base
11 ... fixed base
12 ... Support
13: anti-vibration member
20 ... Motor mount
21 ... Motor
22 ... Small pulley
23 ... Timing belt
30 ... fixed shaft
31, 36… Ball bearing
32 ... Main housing
33 ... Large pulley
34 ... Connecting member
35 ... eccentric housing
35a ... lower end flange
37 ... Eccentric shaft
38 ... Hub
39 ... Long screw
40 ... pin
42 ... Connecting plate
42a ... fixed piece
43 ... First sliding shaft
44 Second sliding shaft
45 ... First bearing
45a ... fixed part
46 ... second bearing
46a ... Flange
461 ... bearing holder
462: Shaft contact
462a ... Back metal
462b ... opening
462c: Resin thin film
47, 49 ... connecting plate
48 ... Fixing member
76A, 76B, 76C, 86 ... Bearing
761, 861 ... Bearing holder
761a: Mounting recess
762, 763, 862, 863 ... Axle contact member
762a, 762b, 764 ... elastic member
765 ... Sleeve
765a: missing part
766: Bearing positioning member
766a: Bearing positioning bolt
766b ... nut
862 ... Ball guide
862a: Ball retainer
862b: Ball

Claims (10)

A shaking table for placing the object to be shaken on the upper surface, and an eccentric rotation mechanism for rotating the shaking table around the main shaft via an eccentric shaft arranged eccentrically with respect to a main shaft rotated and driven by a drive source. A rotation regulating mechanism that regulates the rotation of the shaking table when the shaking table is turned by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move. The other of the first sliding shaft or the first bearing and the other of the second sliding shaft or the second bearing that are fixed and are not fixed to the shaking table and the base are connected to each other,
In the first bearing and / or the second bearing, the shaft contact portion that comes into contact with the first sliding shaft and / or the second sliding shaft has a structure in which a dimensional change due to thermal expansion is small, and the sliding shaft A gap between the outer peripheral surface of the shaft and the inner periphery of the shaft contact portion is narrowed. In the first bearing and / or the second bearing, a shaft contact portion that comes into contact with the first sliding shaft and / or the second sliding shaft is provided with a resin layer having a small friction coefficient using a back metal as a support base. The shaking device according to claim 1, wherein the shaking device is a member of a multi-layer type or an oil-containing metal type. The shaking device according to claim 1, wherein the shaft contact portion is a substantially cylindrical member formed by opening a part of the circumferential direction in a slit shape in the axial direction. The first bearing and / or the second bearing are formed by arranging a plurality of the shaft contact portions at predetermined intervals in the axial direction inside a through hole of a bearing holder having a substantially cylindrical through hole. The shaking device according to any one of claims 1 to 3, wherein the shaking device is provided. The shaking device according to any one of claims 2 to 4, wherein the shaft contact portion is a multilayer member in which a polyacetal resin layer is provided on an inner peripheral surface of a back metal. A shaking table for placing the object to be shaken on the upper surface, and an eccentric rotation mechanism for rotating the shaking table around the main shaft via an eccentric shaft arranged eccentrically with respect to a main shaft rotated and driven by a drive source. A rotation regulating mechanism that regulates the rotation of the shaking table when the shaking table is turned by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move. The other of the first sliding shaft or the first bearing and the other of the second sliding shaft or the second bearing that are fixed and are not fixed to the shaking table and the base are connected to each other,
The first bearing and / or the second bearing includes a bearing holder having a substantially cylindrical through hole, and a sliding shaft that is inside the through hole of the bearing holder and is inserted through the through hole. A plurality of shaft contact members urged so as to press in the direction of the central axis from the bearing shaft, and the sliding shaft is held inside the through hole of the bearing holder by the balance of the pressing force by the plurality of shaft contact members. A shaking device, wherein The shaft contact member is a cylindrical body, and the sliding shaft is formed by an elastic member disposed in a gap between an outer peripheral surface of the shaft contact member and an inner peripheral surface of a through hole of the bearing holder. The shaking device according to claim 6, wherein the shaking device is pressed in a direction of a central axis from an outer peripheral side of the shaking device. The shaft contact member comes into contact with both the inner peripheral surface of the bearing holder and the outer peripheral surface of the sliding shaft, and has an elastic force itself, and the elastic force causes the sliding shaft to move on its outer peripheral side. The shaking device according to claim 6, wherein the shaking device is pressed in the direction of the central axis from the center. A shaking table for placing the object to be shaken on the upper surface, and an eccentric rotation mechanism for rotating the shaking table around the main shaft via an eccentric shaft arranged eccentrically with respect to a main shaft rotated and driven by a drive source. A rotation regulating mechanism that regulates the rotation of the shaking table when the shaking table is turned by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move. The other of the first sliding shaft or the first bearing and the other of the second sliding shaft or the second bearing that are fixed and are not fixed to the shaking table and the base are connected to each other,
In the first bearing and / or the second bearing, a large number of small-diameter balls are rotatably held by a ball retainer at a shaft contact portion that comes into contact with the first sliding shaft and / or the second sliding shaft. A shaking device characterized by being a ball guide. A shaking table for placing the object to be shaken on the upper surface, and an eccentric rotation mechanism for rotating the shaking table around the main shaft via an eccentric shaft arranged eccentrically with respect to a main shaft rotated and driven by a drive source. A rotation regulating mechanism that regulates the rotation of the shaking table when the shaking table is turned by the eccentric rotation mechanism,
The rotation restricting mechanism is provided with a first sliding shaft extending substantially parallel to the turning surface of the shaking table, and substantially parallel to the turning surface of the shaking table and substantially orthogonal to the first sliding shaft. A second sliding shaft extending in the direction, a first bearing for slidably holding the first sliding shaft in the axial direction, and sliding the second sliding shaft in the axial direction. And a second bearing for freely holding,
One of the first sliding shaft and the first bearing is fixed to the shaking table, and one of the second sliding shaft and the second bearing is fixed to a base whose position does not move. The other of the first sliding shaft or the first bearing and the other of the second sliding shaft or the second bearing that are fixed and are not fixed to the shaking table and the base are connected to each other,
In the first bearing and / or the second bearing, the length between both ends of the shaft contact portion that comes into contact with the first sliding shaft and / or the second sliding shaft is one of the length of the sliding shaft. The shaking device is set to be longer than / 2.

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