JP2000009175A - Vibration-proof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the application range of a device whose vibration is prevented and to prevent a vibration-proof function from being deteriorated even when a large load is exerted thereon by providing a complete vibration- proof function relative to all vibrations in vertical, horizontal and circumferential directions. SOLUTION: This vibration-proof device 1 comprises a first case 2 disposed in a lower part, a second case 3 disposed in an upper part, a cushioning member 4 disposed between both the cases 2 and 3, a ball body 5 provided between both the cases 2 and 3 and mounted on the first case 2 so as to freely roll and a journal part 6 for supporting the ball body 5 to support a load exerted on the second case 3 from the upper part by the cushioning member 4 and the ball body 5. When the load is not exerted on the second case 3, the cushioning member 4 supports the second case 3 to form a clearance M1 between the ball body 5 and the second case 3. When a prescribed or more load is exerted on the second case 3, the cushioning member 4 may be pressed to decrease height and the ball body 5 may abut on the second case 3. Each journal part 6 may be composed of a support surface formed with a recessed curved surface and a circular wall part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an anti-vibration device suitable for preventing vibration when using various devices, particularly a printer.

[0002]

2. Description of the Related Art When a printer is used in an office or at home, the table on which the printer is placed cannot be completely fixed so as not to vibrate. Therefore, during printing, the printer is placed on a fixture or rack such as a rack supporting the printer. The monitor screen shakes greatly. In particular, recently, many printers are capable of high-speed printing, and the fluctuation has become extremely large.

[0003] As a device for preventing such vibrations, there is known an anti-sway stand 70 as shown in FIG. The two sets of the anti-swing stand 70 are inserted between the bottom of the printer 71 and the table on which the printer 71 is placed. The reaction of the head (not shown) of the printer 71 is absorbed by the roller 72 of the anti-sway stand 70. That is, by swinging the printer 71 placed on the rollers 72, 72 in the direction of the arrow, the vibration is absorbed, and the vibration is not transmitted to the rack or the monitor screen.

As a countermeasure against earthquakes for large-sized electronic computers and the like, an apparatus supporting apparatus as disclosed in Japanese Patent Application Laid-Open No. 55-33918 is also known. As shown in FIGS. 17 (A) and 17 (B), the device supporting device includes a screw jack 82 between a support floor 81 supporting the device 80 and a tip end of a screw jack 82 provided below the device 80. A container 83 having an inner diameter slightly larger than the outer diameter is interposed.
A plurality of hemispherical concave portions 84 are provided on the bottom surface of the container 83, and balls 85 are arranged in the concave portions 84 so as to roll freely. 86 is attached.

A spacer using a silicone gel is known as a spacer having a vibration-proof structure provided between two members to be assembled (see Japanese Patent Application Laid-Open No. 5-99258). The spacer described in this publication is used, for example, when a hard disk drive is mounted on a frame, and has a configuration shown in FIGS. 18A and 18B. That is, an engineering plastic film 91 and an anti-vibration film 92 made of silicone gel are laminated. Then, a nut or the like is made to penetrate the center hole 93 so as to be sandwiched between the upper and lower frames and the housing.

[0006]

The conventional anti-swing stand 70 for a printer has a large shape and a narrow application range. For example, when a large anti-skid stand 70 is purchased for a large printer, if it is used for a small printer, its length becomes too large, and it protrudes from the lateral depth of the printer. Further, the anti-swing stand 70 is preferable for the lateral vibration of the printer, but cannot exert a sufficient vibration-proof function against vertical vibrations and longitudinal vibrations.

The device supporting device disclosed in Japanese Patent Application Laid-Open No. 55-33918 can cope with horizontal swing such as front and rear, left and right, but cannot sufficiently cope with up and down shaking. Moreover, if the size of the screw jack 82 is different, the container 83 must be a container having a size suitable for the screw jack 82. Screw jack 82
Is attached to the device 80, and a dedicated container 83 is required for each device 80.

The spacer 90 disclosed in Japanese Patent Application Laid-Open No. 5-99258 has an excellent vibration-proof function against vertical movement and horizontal vibration due to the cushioning properties of the silicone gel. However, when a considerably heavy load is applied to the spacer 90 in the vertical direction, the vibration isolating film 92 made of silicone gel falls down to one side and is deformed or largely compressed, so that the vibration isolating function is reduced. Moreover, if a horizontal vibration is generated while a large load is constantly applied from above, the vibration isolation function against the horizontal vibration is greatly deteriorated.

The present invention has been made in order to solve the above problems, and has a sufficient vibration damping function against all vertical, horizontal, and circumferential vibrations, and is a device to be subjected to vibration damping. It is an object of the present invention to provide an anti-vibration device capable of widening an applicable range of the above-described method and preventing the anti-vibration function from being deteriorated even when a large load is applied.

[0010]

According to a first aspect of the present invention, there is provided a vibration isolator according to the first aspect of the present invention.
, A second case disposed above, a cushioning member provided between the two cases, and provided between the two cases and mounted on the first case to be rollable. And a journal portion for supporting the ball, so that a load from above applied to the second case is supported by the cushioning member and the ball.

According to a second aspect of the present invention, in the vibration damping device according to the first aspect, when a load is not applied to the second case, the cushioning member supports the second case, and the ball member is connected to the second case. A gap is formed between the second case and the second case, and when a load equal to or more than a predetermined value is applied, the cushioning member is pressed and the height is reduced, and the ball is brought into contact with the second case. Vibration in a state where is added is received by the ball body and the cushioning member and is absorbed.

Further, the invention according to claim 3 is the invention according to claim 1.
Or the plurality of journal portions are arranged in a circular shape so as to face the first and second cases, respectively, and each journal portion is provided with a concave receiving surface formed of a curved surface and a circular shape. And one ball body is disposed inside each of the walls.

According to a fourth aspect of the present invention, in the vibration isolator according to the first, second or third aspect, the cushioning member is arranged between the journal portions in the circumferential direction.

According to a fifth aspect of the present invention, in the vibration damping device of the first or second aspect, a plurality of journals are provided in the first case, and each journal is provided with a receiving surface having a concave curved surface and a circular shape. The cushioning member is arranged at the center of the second case, and a partitioning portion for preventing the second case from rotating more than a predetermined amount in the circumferential direction is provided on the inner surface of the second case. A plurality of partitions are arranged between the journals, and the relative movement of the two cases in the circumferential direction causes the partitions to abut against the wall to prevent the relative movement.

According to a sixth aspect of the present invention, in the vibration isolator according to the first, second, third, fourth, or fifth aspect, the cushioning member is formed of a silicone gel having elasticity and load absorbing properties as a main component. Substance.

Further, in the invention according to claim 7, in the vibration damping device according to claim 1, 2, 3, 4, 5, or 6,
The journal portion has a configuration in which the ball is held so as to be movable within a predetermined range and in a horizontal direction of 360 degrees, a plurality of the journal portions are provided, and one ball is arranged in each journal portion. .

Further, in the invention according to claim 8, in the vibration isolator according to any one of claims 1 to 7, an integrated means for making the two cases impossible to be separated is provided.

The anti-vibration device of the present invention is disposed so as to be sandwiched between a device that generates vibration or a device that does not want to receive vibration and a base on which the device is placed. Usually, they are placed at the four corners of the device. When the device is placed on the vibration isolator, the load is dispersed and applied to the ball body and the cushioning member via the upper second case. For this reason, both members can cope with a large load sufficiently and cooperate with a horizontal vibration, so that the vibration is absorbed and the vibration is prevented from being transmitted.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolator according to an embodiment of the present invention will be described below with reference to FIGS. The first embodiment will be described first with reference to FIGS.

The vibration isolator 1 of the first embodiment is a vibration isolator mainly used for a printer. Specifically, one anti-vibration device 1 is placed at each of the four lower corners of a printer used at home or at work.

This anti-vibration device 1 is provided between a first dish-shaped case 2 arranged below, a second dish-shaped case 3 arranged above, and both cases 2, 3. A gel-like substance 4 serving as a shock-absorbing member, a ball 5 made of a hard metal material provided between the two cases 2 and 3 and placed on the first case 2, and the ball 5 And a journal section 6 for supporting.

In the first case 2, a plurality of base journals 6a constituting one of the plurality of journals 6 and a concave space 12 for accommodating a part of the mooring part 11 serving as an integrating means are formed. Base 13 for mooring and mooring unit 11
And a flange 15 serving as an entire outer peripheral wall are provided. Base Journal 6
a is a receiving surface 16 formed of a concave curved surface and a small circular wall portion 1.
7. In this embodiment, since three journal portions 6 are provided at intervals of 120 degrees, three base journal portions 6a are similarly provided.

The second case 3 includes a plurality of opposing journal portions 6 constituting the other of the plurality of journal portions 6 respectively.
b, a shaft portion 21 constituting the mooring portion 11, and the shaft portion 21
Non-slip portion 22 formed on the side opposite to the side where the printer or the like is placed, and flange portion 23 serving as the entire outer peripheral wall
The shape and the number are the same as those of the base journal 6a. Non-slip part 22
Protrudes from the upper end surface 3a of the second case 3 by a slight height L1, and has a plurality of concentric grooves formed therein.

The gel-like substance 4 provided between the first case and the second case 3 has a columnar shape and is sandwiched between the two cases 2 and 3 so that both ends thereof are in contact even when there is no load. Have been. In this embodiment, the gel-like substances 4 are arranged at intervals of 120 degrees between the respective circumferential portions of the journal 6. Further, as shown in FIG. 2, the center positions of the gel-like substance 4 and the ball 5 are arranged at intervals of 60 degrees.

The gel-like substance 4 used in this embodiment is a gel-like substance (an intermediate state between liquid and solid) composed mainly of silicone, which has elasticity and load absorbing properties, and has excellent cushioning properties. It has become something. Here, silicone is a generic term for polymers of organosilicon compounds, and depending on the state, is called silicone oil, silicone grease, silicone rubber, silicone resin, or the like. The properties of silicone are
Due to its molecular structure, it has high heat resistance, rich in water repellency, electrical insulation, chemical resistance, weather resistance, non-volatility,
Everything else is better than its pure organic counterpart.

The gel is a sol (colloid solution) solidified in a jelly state. The phenomenon that the sol changes to a gel is called gelation. An attractive force acts between the colloidal particles dispersed in the sol, and many sols show structural viscosity, but when an appropriate stimulus is applied to a substance with a high concentration, the particles are connected to each other and become three-dimensional. It becomes a net-like or honeycomb-like structure, and the dispersion changes to a solid gel.

The characteristics of the gel-like substance 4 are as follows. That is, the penetration (JISK2530-1976-50g load) is 50 to 200 (unit is 1 / 10mm) and the specific gravity is 0.6.
And a tensile strength (JISC2123) of 0.1 to 0.1.
6 kg / cm ² (However, this strength is increased to 27)
And the elongation is 70 to 800%. Penetration 50 ~
In the area of 200, it shows extremely high characteristics in shock absorption, vibration prevention and soundproofing effects. Further, the gel-like substance 4 is adjusted to a special overhead wire state and a special molecular structure, thereby having excellent self-retaining and restoring properties, and having small temperature dependence of vibration-proofing, shock-absorbing and soundproofing properties. Therefore,
Unlike other materials, performance is not exhibited only at room temperature, and high performance can be maintained in a wide temperature range (-50 ° C to 200 ° C).

Such a gel substance 4 has a lower resonance point and a lower resonance magnification than the high-performance anti-vibration rubber, has a short vibration decay time, and has an excellent anti-vibration performance. For example, in terms of the time required to decay to 5% of the initial amplitude, the gel-like substance 4 is 5.6 msec while the high-performance anti-vibration rubber is 10.4 msec. Further, compared to the vibration-proof rubber, the gel-like substance 4 has good weather resistance and chemical resistance, and has a small compression set, so that the durability is remarkably excellent. For example, according to the measurement based on JIS6301 (= 70% compression, left at room temperature for 30 minutes after 70 ° C. × 22 hours), the compression set of the gel-like substance 4 is 3 to 8
% (Some of them are about 16%), 60.3% of urethane-based high damping rubber and 25.5% of natural rubber.
The distortion is much smaller than 1%.

The ball 5 is a ball, and forms a rolling thrust bearing with the journal portion 6. The concave curved surfaces of the receiving surfaces 16 and 24 suppress the swinging motion of the upper case 3 and the devices mounted on the upper case 3,
And automatic return of the ball body 5 and the upper case 3 to predetermined positions. If the inclination of the installation place of the vibration isolator 1 is within a predetermined range, the receiving surface 16,
The concave curved surface of 24 enables automatic return even when there is no gel-like substance 4 as a buffer member.

When no load is applied on the second case 3, the gel-like substance 4 supports the second case 3,
A gap M1 is formed between the ball 5 and the receiving surface 24 of the second case 3. When a load equal to or more than a predetermined value is applied to the second case 3, the gel material 4 is pressed and the height is reduced, the gap M1 is eliminated, and the ball 5 is moved to the second case 3.
It is configured to abut against. When vibration is generated in the horizontal direction while a load is applied, the gel-like substance 4 is tilted obliquely as shown in FIG. At 25, the state is sandwiched.

In the state shown in FIG. 5, the upper case 3 does not move further in the direction of arrow A. The swing usually returns in the opposite direction, and then the second case 3 moves in the direction of arrow B. This horizontal swing is indicated by arrow AB.
Not only in the direction but also in all directions, that is, over 360 °, the vibration isolator 1 has a symmetric structure with respect to all directions, so that it is possible to cope with it. It is also possible to cope with movement (rotation) in the circumferential direction. As shown in FIG. 5, when the second case 3 has moved the most, the second case 3 becomes the second case 2
Is shifted by the distance N1. This distance N1
Is also the distance at which the second case 3 can rotate and shift with respect to the first case 2.

The mooring portion 11 is provided with a shaft portion 21 of the second case 3.
And a circular locking portion 31 which is engaged with the shaft portion 21 and has a diameter larger than the diameter of the hole 14 to prevent the circular locking portion 31 from coming off. When the circular locking portion 31 moves, the diameter of the hole 14 gradually increases toward the outside so as not to hinder the operation even if the circular locking portion 31 collides with the outer circumference of the hole 14. A tapered portion 13a formed by a smooth curve that increases is provided. Note that the tapered portion 13a may be a linear taper.

In the vibration isolator 1 of the first embodiment, since the receiving surfaces 16, 24 having concave curved surfaces are formed on both cases 2, 3, the ball body 5 can be smoothly returned to the original position. Becomes Further, the mooring portion 11 can be formed with a large space in the center, so that the work of integrating the two cases 2 and 3 is made more efficient, and the situation in which the members in the two cases 2 and 3 jump out to the outside and are broken can be prevented. . Further, the slip stopper 22 prevents the second case 3 from slipping between the mounted device such as a printer.

Next, a vibration isolator 41 according to a second embodiment will be described with reference to FIGS. The vibration isolator 41 is also mainly applied to a printer.

Similarly to the vibration isolator 1 of the first embodiment, the vibration isolator 41 has a dish-shaped first case 42 arranged below and a dish-shaped second case 42 arranged above. Case 43
A gel-like substance 44 serving as a buffer member provided between the two cases 42 and 43; and a hard metal material provided between the two cases 42 and 43 and placed on the first case 42. And a journal 46 for supporting the ball 45.

The first case 42 is provided with a plurality of base journals 46a each constituting one of the plurality of journals 46, and a flange 47 serving as an entire outer peripheral wall. The base journal portion 46a includes a receiving surface 48 having a concave curved surface and a small circular wall portion 49. The receiving surface 48 is formed of a central spherical portion 48a where the center of the ball body 45 draws a spherical dry trace and a conical portion 48b where a conical surface dry trace is drawn. As shown in FIG. 7, the central spherical portion 48a has a diameter φ1 at the center of the receiving surface 48,
The remaining outer peripheral portion corresponds to the conical portion 48b. Note that, in this embodiment, the journal part 46 is
Therefore, six base journal portions 46a are similarly provided.

The ball body 45 comes into contact with the second case 43, and the opposing flat journal portion 46b which forms the other of the plurality of journal portions 46, respectively, and the second case 43 rotates in the circumferential direction. A plurality of partitions 51 for preventing the separation of the gel-like substance 44, a contact flat surface 52 on which the gel-like substance 44 is fixed, and a surface opposite to the partition 51 on which a device such as a printer is placed. The provided non-slip portion 53 and a flange portion 54 serving as the entire outer peripheral wall are provided.

The opposed flat journal portion 46b has a bearing function when a part of the flat portion between the partition portions 51 abuts on the ball body 45. The non-slip portion 53 is provided on the upper end surface 43 of the second case 43.
A plurality of concentric grooves protruding upward by a height L2 from a are formed. At the center of the plurality of grooves, a rectangular flat portion 53a on which a character indicating the upper side, for example, a character of "upper surface" can be written is provided.

The gel-like material storage 44 provided between the two cases 42 and 43 has a cubic shape, and is sandwiched between the two cases 42 and 43 so that the upper and lower ends thereof abut even when there is no load. It is fixed to the cases 42 and 43 with an adhesive or the like. In the second embodiment, the gel substance 44
Is disposed at the center of both cases 42 and 43.
Further, the gel-like substance 44 used in the second embodiment is used.
Is made of the same material as the gel-like substance 4 of the first embodiment, and has similar characteristics.

The ball 45 has a spherical shape and forms a rolling thrust bearing together with the journal 46. The function of this bearing is the same as the function of the ball 5 and the journal 6 of the first embodiment.

When no load is applied to the second case 43 and no load is applied, the gel-like substance 44 supports the second case 43, and the ball body 45 and the opposed flat journal portion 46b of the second case 43. Is formed between them.
When a load equal to or more than a predetermined value is applied to the second case 43, the gel-like substance 44 is pressed to reduce the height, the gap M2 is eliminated, and the ball body 45 comes into contact with the second case 43. (See FIG. 13). Further, when vibration is generated in the horizontal direction while a load is applied, as shown in FIG.
The ball body 45 comes into contact with the wall 49 of the journal 46.

In the state shown in FIG. 14, the upper case 43 does not move further in the direction of arrow A. The swing in the horizontal direction is not limited to the arrow AB direction,
Even if the same operation is performed over 60 °, the vibration isolator 41 has a symmetrical structure in all directions, so that it is possible to cope with it. It is also possible to cope with movement (rotation) in the circumferential direction.

As shown in FIG. 14, when the second case 43 moves most, the second case 43 is shifted from the second case 42 by the distance N2.
The distance N2 is also a distance at which the second case 43 can rotate and shift. In addition, the ball body 45 is the wall 4
9, on the opposite side, the second case is attached to the first case 42.
Of the case 43 comes into contact with each other (see FIG. 14).
Further movement of the second case 43 in the direction A is prevented.

In the second embodiment, there is no mooring section 11 as in the first embodiment. However, in order to integrate the two cases 42 and 43, an adhesive is applied to the upper and lower end surfaces of the gel substance 44, and the gel substance 44 and the two cases 42 and 43 are fixed. This configuration is a kind of integrated means.

Further, the vibration isolator 4 according to the second embodiment
1 is the second case 43 because the partition 51 exists.
Is restricted in the circumferential direction (rotation). In this embodiment, as shown in FIG. 12, the maximum rotation angle α from the original position is about 12 degrees. For this reason, even if a strong twist vibration is applied to the gel-like substance 44, both cases 4
The gel-like substance 44 does not dissociate from 2, 43.

Each of the above embodiments is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. It is. For example, in each of the above-described embodiments, when no load is applied, the gaps M1 and M2 are provided between the ball bodies 5 and 45 and the second cases 3 and 43, but FIG. As shown, a gap may not be formed even when there is no load.

The anti-vibration device 61 shown in FIG.
Since it has a configuration similar to that of the first embodiment, the same members are denoted by the same reference numerals. This vibration isolator 61
The difference from the vibration isolator 1 is that no gap is provided and that the receiving surface of the journal portion 6 is not a curved surface but a flat surface. Since the receiving surface is flat, the vertical distance from the first case 2 does not change even if the second case 3 swings. Therefore, as shown in FIG. 15 (B), when the second case 3 moves, only the second case 3 moves parallel from FIG. 15 (A).

In each of the embodiments, the gel material 4 or 44 is used as a buffer member. However, other buffer members such as rubber, oil dampers, springs, and plastics having elasticity may be used. . In addition, both cases 2,
Each of 3, 42 and 43 is made of resin, but may be made of metal. In addition, the balls 5 and 45 may be made of hard plastic called engineering plastic or other materials other than metal.

Further, in each drawing, the case disposed on the lower side is referred to as a first case, and the case disposed on the upper side is referred to as a second case.
61 may be used upside down in the drawing. That is, for example, the first case 2 in FIG. 1 may be used with the upper side up and the second case 3 with the lower side. In this case, the lower case is the first case, and the upper case is the second case.

Also, in each of the above-described embodiments, the case where the equipment mounted on the upper second case 3, 43 generates vibration is intended, but the lower first case 2, 42 is When the part to be placed vibrates, the present invention can also be applied to a case where it is desired to prevent the vibration from being transmitted to a device placed above the second case 3, 43.

In the above-described embodiment, the case where the present invention is applied to a printer has been described.
The present invention can be applied to all devices that do not want to transmit vibration to others and do not want to receive external vibration, such as an A device, a motor (motor), a pump, a speaker, a precision measuring instrument, and an exhibition shelf.

[0052]

According to the first aspect of the present invention, the load from above is supported by the ball member mounted on the first case and rollable, and the cushioning member. It has a sufficient anti-vibration function against vibration. Further, when a large load is applied, the ball is mainly received by the ball body, so that it can cope with a large load as compared with only the cushioning member, and the application range is wide. In addition, since the load is applied to the ball and the cushioning member, the load applied to the cushioning member can be reduced, and the compression set can be reduced. Therefore, deterioration of the vibration isolation function can be suppressed to a small level, and stable vibration isolation performance can be exhibited over a long period of time.

According to the second aspect of the present invention, when no load is applied, only the load of the second case is applied to the cushioning member. Is required, the anti-vibration function hardly deteriorates. When a load is applied, the cushioning member is pressed and the height is reduced, and the ball receives the load. For this reason, the prevention of vibration transmission and the absorption of vibration are reliably achieved by the rolling of the ball body and the buffering force of the buffer member.

Further, according to the third aspect of the present invention, since the journal portion having the ball body is arranged in a circular shape, it can be easily formed in a point-symmetrical shape, and can easily be formed regardless of the direction of vibration. . In addition, since the buffer member is arranged in the circumferential direction of the journal portion, another means, for example, a mooring portion for integrating the two cases can be easily provided in the central space. It can be installed.

According to the fifth aspect of the invention, since the relative movement of the two cases in the circumferential direction by a predetermined amount or more is prevented by the partition portion, even if a strong circumferential force is applied, the shock absorbing member and the journal portion may be damaged. I will not give. Further, the partition portion also helps to increase the strength of the second case, which leads to a longer life and a higher strength of the vibration isolator.

Further, in the invention according to the sixth aspect, since the cushioning member is made of a gel-like substance containing silicone gel as a main component, it is excellent in vibration damping properties, shock absorption properties and durability, and is resistant to temperature changes. A vibration isolator with little change in characteristics can be obtained.

In addition, according to the invention of claim 7, one ball is provided in each of the plurality of journals so as to be movable within a predetermined range and in a horizontal direction of 360 degrees. Rolling in each direction becomes smooth, and the anti-vibration function becomes high.

According to the invention of claim 8, since the two cases of the vibration isolator are integrated and cannot be separated, there is a danger that once assembled, the internal ball body and the cushioning member will come out. Can be completely eliminated.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a vibration isolator according to a first embodiment of the present invention when no load is applied.

FIG. 2 is a plan view seen from a direction indicated by an arrow II in FIG. 1;

FIG. 3 is a plan view of a lower first case of the vibration isolator of FIG. 1 as viewed from above.

FIG. 4 is a bottom view of the upper second case of the vibration isolator of FIG. 1 as viewed from below.

5 is a side cross-sectional view when a load is applied to the vibration isolator of FIG. 1 and swings in a horizontal direction, and a partially enlarged view thereof.

FIG. 6 is a plan view as seen from a direction indicated by an arrow VI in FIG. 5;

FIG. 7 is a side cross-sectional view of the vibration isolator according to the second embodiment of the present invention when no load is applied, and a partially enlarged view thereof.

FIG. 8 is a plan view seen from the direction of arrow VIII in FIG. 7;

FIG. 9 is a bottom view as seen from the direction of arrow IX in FIG. 7;

FIG. 10 is a plan view of the lower first case of the vibration isolator of FIG. 7 as viewed from above.

FIG. 11 is a bottom view of the upper second case of the vibration isolator of FIG. 7 as viewed from below.

FIG. 12 is a view for explaining a state in which the upper second case of the vibration isolator of FIG. 7 is rotated to the maximum in the circumferential direction.

13 is a side view and a sectional view when a load is applied to the vibration isolator of FIG. 7, in which a left half is a side view and a right half is a sectional view.

FIG. 14 is a side cross-sectional view when a load is applied to the vibration isolator of FIG. 7 and the vibration isolator swings in a horizontal direction.

FIG. 15 is a view showing an example in which the vibration damping device according to the first embodiment of the present invention is partially modified, and FIG.
(B) is a side sectional view when the upper second case swings in the horizontal direction.

FIG. 16 is a perspective view of an anti-sway stand for a printer as an example of a conventional vibration isolator.

FIG. 17 is a view showing another example of a conventional vibration damping device, showing a device supporting device for a large-sized computer or the like, wherein FIG. 17A is an overall front view showing an attached state, and FIG. FIG.

FIG. 18 is a view showing a spacer of a hard disk drive or the like in still another example of the conventional dustproof device, (A) is a perspective view showing one example of the spacer, and (B) is another view of the spacer. It is an exploded perspective view showing an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration isolator 2 1st case 3 2nd case 4 Gel substance (buffer member) 5 Ball body 6 Journal part 11 Mooring part (integral means) 24 Receiving surface 25 Wall part 51 Partition part M1, M2 Gap

Claims (8)

[Claims] 1. A first case disposed below, a second case disposed above, a cushioning member provided between the two cases, and a first case provided between the two cases. A ball that is placed on the case and rolled,
A vibration isolator, comprising: a journal portion for supporting the ball; and a load from above applied to the second case is supported by the cushioning member and the ball. 2. When a load is not applied on the second case, the cushioning member supports the second case, and a gap is formed between the ball body and the second case. When a load equal to or more than a predetermined load is applied, the shock-absorbing member is pressed and the height is reduced, and the ball body is configured to contact the second case, and the vibration under the load is applied, The vibration isolator according to claim 1, wherein the vibration is absorbed while being received by the ball body and the cushioning member. 3. A plurality of the journal portions are arranged in a circular shape so as to face the first and second cases, respectively, and each journal portion is provided with a receiving surface having a concave curved surface, and a circular wall. The vibration isolator according to claim 1 or 2, wherein each of said ball bodies is disposed therein. 4. An anti-vibration device according to claim 1, wherein said buffer member is arranged between said journal portions in a circumferential direction. 5. A plurality of said journal portions are provided in said first case, each journal portion is composed of a receiving surface formed of a concave curved surface and a circular wall portion, and said buffer member is formed in said second case. In the center of the second case, and a second
A plurality of partitions are provided for preventing the case from rotating more than a predetermined amount in the circumferential direction, each partition is disposed between the journals, and the relative movement of the two cases in the circumferential direction causes the partition to move. 3. An anti-vibration device according to claim 1, wherein the vibration isolator strikes a wall to prevent relative movement thereof. 6. The vibration damping device according to claim 1, wherein the shock-absorbing member is a gel-like substance mainly composed of silicone gel having elasticity and load absorbing property. . 7. The journal section is configured such that the ball body is held so as to be movable within a predetermined range and in a horizontal direction of 360 degrees, a plurality of journal sections are provided, and the ball body is attached to each journal section. 7. The vibration isolator according to claim 1, 2, 3, 4, 5, or 6, wherein one is arranged one by one. 8. An anti-vibration device according to claim 1, further comprising an integrated means for preventing the two cases from being separated from each other.