JP2000081037A - Rotatably pivoting method and rotatably pivoting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and inexpensive rotatably pivoting method and rotatably pivoting mechanism which is strong against a strong impact force and in which a smooth rotation is maintained, even if a rotary shaft is slanted. SOLUTION: By the preload of an elastic body 8, the inner races 41, 51 of a bearings 4, 5 are moved and ball shape rotating bodies 42, 52 are held in the groove between the inner races 41, 51 and outer races 43, 53 rotatably without a clearance. A rotary shaft 2 is fitted into only the inner race 41 of a first bearing 4 and a second bearing 5 is not contacted with the rotary shaft 2. By the slant of the rotary shaft 2, the positions of the groove contacted by the ball shape rotary bodies 42, 52 respectively are moved up to a balance point, but by the regular preload of the elastic body 8, they are held rotatably in a no gap state always. The radius of each groove is bigger than that of the ball shape rotary bodies 42, 52 and the rotary shaft 2 is rotated precisely while slanting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft supporting method and a rotating shaft supporting mechanism.

[0002]

2. Description of the Related Art In recent years, as devices have become smaller and lighter, there has been a demand for smaller and lighter mechanical parts. This tendency is remarkable especially in information equipment, information home appliances, and optical equipment, and there is a demand for a technology that can realize high precision with downsizing. Among such techniques, a precision rotation mechanism is particularly widely applied.

For example, a variable apex angle prism incorporated for correcting camera shake when an image is captured by a video camera changes the thickness of the prism according to the camera shake angle by means of an actuator, thereby refracting the light axis passing through the prism element. For correcting the shaft angle, a precision rotation mechanism is used for this actuator portion.

[0004] As shown in FIG. 11, a rotating body 1 is supported on a general rotating shaft in such a precision rotating mechanism.
01 with a sufficiently long sliding bearing 112
Some are supported by Alternatively, instead of a long slide bearing, there is a type that uses a plurality of slide bearings, a plurality of ball bearings, or the like, and the configuration shown in FIG. It is supported by two first bearings 104 and second bearings 105 disposed in the through hole.

[0005] By the way, the rotating body as described above may generate a tilting force to the rotating shaft due to the action of external force or gravity. As shown in FIG.
When there is a gap between the rotating shaft portion 103 inserted into zero and the support surface, that is, play, when the external force or gravity acts, the rotating shaft portion 103 is inclined by the play. Assuming that the amount of inclination at the end of the rotating shaft 103 is S, the radius of the rotating body 111 is R, and the total length of the rotating shaft 103 is L, the amount of inclination D at the outer periphery of the rotating body 111 is D = S · R / L. Therefore, when the length of the rotating shaft portion L is not sufficiently provided with respect to the rotating radius R, a bearing structure with a small gap is particularly important.

In the case of a rotating body 111 having a long rotating radius as shown in FIG. 14, the rotating shaft portion 103 is supported by a first bearing 104 and a second bearing 105, but the rotating body 111 is symmetrical with the rotating body. However, since the weight balance is unbalanced, a strong moment force N is generated in the shaft support portion. Further, when the rigidity of the rotating body 111 itself is not sufficient, the rotating body 111 is deformed, and the leading end is displaced by the distance d.

Therefore, in the case where sufficient rigidity of the rotating body itself cannot be ensured as described above, or when the rotating body has an unbalanced structure, a configuration for supporting and guiding the rotating body on a rotation locus is adopted. For example, there is an apparatus in which an arc-shaped rail is provided at a radial end position of a rotating body or on a rotation trajectory on a fixed side, and the rail is traced by a roller or a sliding surface attached to the rotating body or the fixed side.

FIG. 15 is a schematic sectional view of an example of such a conventional rotary shaft support mechanism. The illustrated rotating support mechanism is
A portion provided with two ball bearings 104 and 105 for supporting the rotating shaft portion 103 and a rotating body 11 having an unbalanced weight balance;
A rotatable roller 1 provided on the rotation locus of the end E of 1 '
Numeral 12 is a combination with an end supporting portion that reciprocates on a rail 113 fixed to the frame 11. Also, the vicinity of the end E of the rotating body 111 'and the frame 11
The coil spring 114 inserted between the zeros presses the roller 112 against the surface of the rail 113 by the restoring force.

In the configuration of the present embodiment, two ball bearings 104, 1
Since the rotating shaft 103 is fitted on both inner circumferences of the inner ring portions 104a and 105a of the inner ring 05, the inclination of the rotating shaft 103 is restricted to be small. Therefore, the height of the end E of the rotating body 111 ′, that is, the position in the same direction as the direction indicated by the central axis of the rotating shaft 103 is also restricted to be small. In this configuration,
Since one end of the coil spring 114 is fixed to the frame 110, the range of movement of the end E of the rotating body 111 'in the radial tangential direction is restricted, so that the rotating body 111' is not rotated but within a predetermined angle range. It turns with.

FIG. 16 is a schematic sectional view of another example of the conventional rotary shaft support mechanism. The illustrated rotating shaft support mechanism includes a ball 242 loosely slidably inserted into a recess of the frame 210, and includes a pivot bearing mechanism 204 that supports the rotating body 211 ′ around the rotation axis and a rotation trajectory. Fixed rail 213
In combination with the terminal mechanism 205 for tracing.

Rotational movement is regulated by the pivot bearing mechanism 204, and rotational movement on the plane is regulated by the roller 212 between the fixed plane rail 213 of the end mechanism 205 and the rotating body 211 '. Here, the coil spring 214 provided below the rotating body 211 ′ is for moving the rotating body 211 ′ against the rail 213, and presses the roller 212 against the surface of the rail 213 by the restoring force of the extended coil spring 214. .

[0012] This configuration also has a coil spring 2 similar to the above.
Since one end of 14 is fixed to the frame 210, the range of movement of the end E of the rotating body 211 'in the radial tangential direction is restricted, so that the rotating body 211' is not rotated but within a predetermined angle range. It turns.

[0013]

In the example of FIG. 15,
The end E of the rotating body 111 ′ is formed by the ball bearings 104 and 105.
The allowable variation range of the height of the rail 113 is restricted to a small value as described above, so that there is a restriction that the variation range of the height of the rail 113 must be controlled to be small. As a result, if the fluctuation of the height of the rail 113 exceeds the allowable range,
A gap g 'is generated between the roller 112 and the rail 113 as shown in the figure, but the extended coil spring 114 causes the roller 112 to move the roller 112 by the restoring force.
It is pressed against the surface.

For this reason, a load is applied to the rotating body 111 'and the shaft supporting portion, so that the required rotation accuracy cannot be ensured.
Further, there is a possibility that the bearing portion and the like may be damaged.

Further, in the configuration using the pivot bearing shown in FIG. 16, the pivot bearing 204 is manufactured with high accuracy, and the play portion (gap) between the sliding surface of the frame 210 and the ball 242 is adjusted to a minimum. Comes with difficulties. Further, in this case, if the play portion (gap) is reduced by applying a pressure to the pivot bearing 204, the sliding friction resistance generated thereby becomes much larger than the rolling friction resistance when using a ball bearing. There is a disadvantage that the rotational power increases and smooth sliding becomes difficult.

In the case where the apparatus is composed of a plurality of support mechanisms as described above, for example, as described above, the rotation trajectory or the unevenness of the rotation trajectory causes the collision between the support mechanisms, thereby lowering the rotation accuracy and the mechanism section. Life is shortened. Therefore, in the conventional configuration, it is necessary to use an assembly structure capable of adjusting the position of each support mechanism, or a structure that secures a degree of freedom capable of absorbing a conflict generated between the support mechanisms.
In the case where the position adjustment is provided in the support mechanism, there is a problem that the apparatus cost increases, and in the case of a mechanism having a degree of freedom, there is a problem that the rotation accuracy is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and the rotation or rotation is maintained smoothly and with high rotation accuracy even if the rotation shaft portion is inclined. It is an object of the present invention to provide a low-rotation power and low-cost rotating shaft supporting method and a rotating shaft supporting mechanism that have a firm configuration even when a strong impact force is applied.

[0018]

In order to solve the problems of the prior art based on the above-mentioned principle, a rotating shaft support mechanism according to the present invention comprises a rotating shaft portion, an inner ring portion, an outer ring portion and a ball-shaped rotating member. A groove is formed in the outer periphery of the inner ring portion and the inner periphery of the outer ring portion, respectively, and the ball-shaped rotating body is rotatably held between the two grooves. A first bearing and a second bearing configured to be rotatable with each other via the ball-shaped rotator, and the rotating shaft portion is fitted to an inner periphery of the inner ring portion of the first bearing. And the outer ring portion is fixed to a frame, wherein the outer ring portion is fixed to a frame, and the two grooves formed in the inner ring portion and the outer ring portion of at least one of the first bearing and the second bearing. The radius or curvature of at least one of the cross sections is larger than the radius of the ball-shaped rotating body, An outer ring portion of the second bearing is fixedly mounted on the frame at a position away from the fixed position of the first bearing, while the rotating shaft portion is inserted through the inner circumference of the inner ring portion of the second bearing in a non-contact manner. And the elastic member is always compressed and interposed in the longitudinal direction of the rotary shaft between the distal end of the rotary shaft and the end face of the inner ring of the second bearing. It is characterized by.

According to the above configuration, the inner ring portion of the second bearing is pressed in the direction of the first bearing by the pressure of the elastic member, and the groove of the inner ring portion having a large radius or curvature is formed. The groove end in the direction opposite to the pressing direction pushes the ball-shaped rotator in the direction of the first bearing, and the pushed ball-shaped rotator moves the groove having a large radius or curvature of the second bearing outer ring near the first bearing. By moving to the groove end and being pressed, there is no gap between the two grooves of the second bearing and the ball-shaped rotating body, and the inner ring portion can rotate smoothly with respect to the outer ring portion, and the rotating shaft portion On the contrary, it is pressed in the direction from the first bearing to the second bearing via the fixed groove end of the outer ring, the ball-shaped rotator and the groove end of the inner ring.
Thus, the second bearing acts as a force transmission mechanism while maintaining the rotation function.

As a result, the rotating shaft moves in the direction of the second bearing, and the groove end of the groove having a large radius or curvature of the inner ring portion of the first bearing fitted to the rotating shaft is connected to the second rotating body. Push in the direction of the bearing, the pressed ball-shaped rotating body is the first
The groove moves to the groove end near the second bearing of the groove having a large radius or curvature of the outer ring portion of the bearing, so that there is no gap in the first bearing and the inner ring portion can rotate smoothly with respect to the outer ring portion. Become.

Here, when an external force or the like that inclines the rotary shaft portion acts, the rotary shaft portion is supported only by the first bearing, so that both the grooves of the inner ring portion and the outer ring portion and the ball-shaped rotator are formed. The rotation shaft can be freely tilted as long as the play portion is within the allowable range. In addition, at this time, since the second bearing is not in contact with the rotating shaft, the inclination of the rotating shaft is not hindered by the second bearing. As described above, the first bearing functions as a mechanism for absorbing the inclination generated in the rotation shaft while maintaining the rotation function.

The method according to the present invention is characterized in that an inner ring portion, an outer ring portion, and a ball-shaped rotator are provided, and grooves are respectively formed in the outer periphery of the inner ring portion and the inner periphery of the outer ring portion. A first bearing and a first bearing, wherein the ball-shaped rotator is rotatably held between the grooves, and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator. A rotating shaft supporting method in which the outer ring portion of the first bearing is fixed to a frame using a two-bearing, and a rotating shaft portion is fitted to an inner periphery of the inner ring portion of the first bearing. 1 bearing and 2nd
A radius or a curvature of a cross section of at least one of the grooves formed in the inner ring portion and the outer ring portion of at least one of the bearings is larger than a radius of the ball-shaped rotating body, and The outer ring portion of the second bearing is fixed at a position away from the 1 bearing fixed position, and the end of the rotating shaft portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner. The inner ring portion of the second bearing is stretched, and the inner ring portion of the second bearing is pressed in the first bearing direction by the pressurization by interposing a pressurizing means between the end portion and the end surface of the inner ring portion. I do.

According to the above-described method, the inner ring portion of the second bearing is pressed in the direction of the first bearing by the pressurizing means, and the groove end in the groove having a large radius or curvature causes the ball-shaped rotating body to be in the first position. By pushing in the direction of the bearing, the pressed ball-shaped rotator moves to the groove end of the groove having a large radius or curvature of the second bearing outer ring portion and is pressed, the gap in the second bearing disappears, and The inner ring portion smoothly rotates with respect to the outer ring portion, and the rotating shaft portion moves from the first bearing to the second bearing portion via the groove end of the fixed outer ring portion, the ball-shaped rotating body, and the groove end of the inner ring portion. It is pressed in the direction toward the bearing. Thus, the second bearing acts as a force transmission mechanism while maintaining the rotation function.

As a result, the groove end of the inner ring portion fitted to the rotating shaft portion of the first bearing in the groove having a large radius or curvature pushes the ball-shaped rotating body in the direction of the second bearing, and the pressed ball is pressed. State in which the gap in the first bearing disappears and the inner ring rotates smoothly with respect to the outer ring, when the rotator moves to the groove end of the groove having a large radius or curvature of the first bearing outer ring. Becomes

Here, when an external force or the like that inclines the rotating shaft portion acts, the rotating shaft portion is supported only by the first bearing, so that both the grooves of the inner ring portion and the outer ring portion and the ball-shaped rotating body are formed. The rotation shaft can be freely tilted as long as the play portion is within the allowable range. In addition, at this time, since the second bearing is not in contact with the rotating shaft, the inclination of the rotating shaft is not hindered by the second bearing. Thus, the first bearing acts as a mechanism for absorbing the inclination of the rotating shaft while maintaining the rotating function.

Alternatively, the rotating shaft support mechanism according to the present invention includes a rotating shaft portion, a rotating body extending perpendicular to the axial direction of the rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotating body. Grooves are respectively formed in the outer periphery of the inner ring portion and the inner periphery of the outer ring portion, and the ball-shaped rotating body is rotatably held between the two grooves. Comprises a first bearing and a second bearing which are configured to be mutually rotatable via the ball-shaped rotator, and wherein the rotating shaft portion is fitted to the inner periphery of the inner ring portion of the first bearing. A rotating shaft support mechanism having the outer ring fixed to a frame, wherein at least one of the grooves formed in the inner ring and the outer ring of at least one of the first bearing and the second bearing; The cross-section radius or curvature is larger than the radius of the ball-shaped rotating body,
An outer ring portion of the second bearing is fixed to a position of the frame away from the first bearing fixing position,
The distal end of the rotary shaft extends through the inner periphery of the inner ring of the second bearing in a non-contact manner and extends between the distal end of the rotary shaft and the end surface of the inner ring of the second bearing. An elastic member is always compressed and interposed in the longitudinal direction of the rotating shaft portion, and a rotatable disk or ball is disposed at an arbitrary position in a terminal direction of the rotating body extending perpendicular to the axial direction. And a guide strip capable of contacting the disc or ball is fixed to the frame, and a pressurizing portion having an elastic force for pressing the disc or ball in the direction of the guide strip is provided by the rotating body. Between the end of the frame and the frame.

According to the above configuration, the inner ring portion of the second bearing is pressed in the direction of the first bearing by the pressurization of the elastic member, so that the groove end of the groove having a large radius or curvature connects the ball-shaped rotary body to the first bearing. By pressing in the direction of 1 bearing, the pressed ball-shaped rotating body moves to the groove end of the groove having a large radius or curvature of the second bearing outer ring portion and is pressed, whereby the gap in the second bearing disappears, In addition, the inner ring portion smoothly rotates with respect to the outer ring portion, and the rotating shaft portion is moved from the first bearing through the fixed groove end of the outer ring portion, the ball-shaped rotator, and the groove end of the inner ring portion. 2 Pressed in the direction toward the bearing.
Thus, the second bearing acts as a force transmission mechanism while maintaining the rotation function.

As a result, the groove end in the groove having a large radius or curvature of the inner ring portion fitted to the rotating shaft portion of the first bearing pushes the ball-shaped rotator in the direction of the second bearing, and the pushed ball. State in which the gap in the first bearing disappears and the inner ring rotates smoothly with respect to the outer ring, when the rotator moves to the groove end of the groove having a large radius or curvature of the first bearing outer ring. Becomes

On the other hand, the disk or sphere disposed at the end of the rotating body extending perpendicularly to the axial direction is pressed by the pressurizing section against the guide strip fixed to the frame, and is rotated by the guide strip. The end of the body is supported, and as a result, the occurrence of bending of the rotating body due to its own weight or the like is reduced.

When the end of the rotating body moves along the guiding strip, if the guiding strip is not flat, the end of the rotating body is displaced up and down, thereby generating a force for tilting the rotating shaft. Since the shaft portion is supported only by the first bearing, the inclination of the rotation shaft portion is not affected as long as it is within a range allowed by both the grooves of the inner ring portion and the outer ring portion and the play portion formed by the ball-shaped rotator. Will be lost. In addition, at this time, the second bearing is not in contact with the rotating shaft, so that the second bearing does not prevent the rotating shaft from being inclined. As described above, the first bearing functions as a mechanism for absorbing the inclination of the rotating shaft generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft.

Alternatively, the rotating shaft supporting method according to the present invention comprises an inner ring portion, an outer ring portion, and a ball-shaped rotating body, wherein grooves are respectively formed on the outer periphery of the inner ring portion and the inner periphery of the outer ring portion. A first bearing in which the ball-shaped rotator is rotatably held between the grooves, and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator. A rotating body is provided, using a second bearing, fixing the outer ring portion of the first bearing to a frame, and extending, at the inner periphery of the inner ring portion of the first bearing, orthogonally to a longitudinal direction. In the rotating shaft supporting method for fitting a rotating shaft portion, a radius of a cross section of at least one of the grooves recessed in an inner ring portion and an outer ring portion of at least one of the first bearing and the second bearing. Or, make the curvature larger than the radius of the ball-shaped rotating body, and The outer ring portion of the second bearing is fixed at a position away from the fixed position of the first bearing, and the end of the rotating shaft portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner. And pressurizing the inner ring portion of the second bearing in the direction of the first bearing by the pressurizing by interposing a pressurizing means between the end portion and the end face of the inner ring portion, and A rotatable disk or ball disposed at an arbitrary position in the distal direction of the rotating body is pressed against a guide strip fixed to the frame by a pressurizing section having elasticity.

According to the above-mentioned method, the inner ring portion of the second bearing is pressed in the direction of the first bearing by the pressurizing means, and the groove end in the groove having a large radius or curvature is the first ball-shaped rotating body. By pushing in the direction of the bearing, the pressed ball-shaped rotator moves to the groove end of the groove having a large radius or curvature of the second bearing outer ring portion and is pressed, the gap in the second bearing disappears, and The inner ring portion smoothly rotates with respect to the outer ring portion, and the rotating shaft portion moves from the first bearing to the second bearing portion via the groove end of the fixed outer ring portion, the ball-shaped rotating body, and the groove end of the inner ring portion. It is pressed in the direction toward the bearing. Thus, the second bearing functions to transmit the force while maintaining the rotation function.

As a result, the groove end of the inner ring portion fitted to the rotating shaft portion of the first bearing in the groove having a large radius or curvature pushes the ball-shaped rotator in the direction of the second bearing, and the pushed ball. State in which the gap in the first bearing disappears and the inner ring rotates smoothly with respect to the outer ring, when the rotator moves to the groove end of the groove having a large radius or curvature of the first bearing outer ring. Becomes

On the other hand, a disc or a sphere disposed at the end of a rotating body extending perpendicularly to the axial direction is pressed by guide members fixed to the frame by a pressurizing portion, and moves along the guide members. Since it is movable, the guide strip supports the end of the rotating body, and as a result, the occurrence of bending of the rotating body due to its own weight or the like is reduced.

When the end of the rotating body moves along the guiding strip, if the guiding strip is not flat, the end of the rotating body is displaced up and down, thereby generating a force for tilting the rotating shaft. Since the shaft portion is supported only by the first bearing, the inclination of the rotation shaft portion is not affected as long as it is within a range allowed by both the grooves of the inner ring portion and the outer ring portion and the play portion formed by the ball-shaped rotator. Will be lost. In addition, at this time, the second bearing is not in contact with the rotating shaft, so that the second bearing does not prevent the rotating shaft from being inclined. As described above, the first bearing functions to absorb the inclination of the rotating shaft portion generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft portion.

Alternatively, the rotating shaft support mechanism according to the present invention comprises a rotating shaft portion, a rotating body extending perpendicularly to the longitudinal direction of the rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotating body. Grooves are respectively provided on the outer periphery of the inner ring portion and the inner periphery of the outer ring portion,
A first bearing and a second bearing, wherein the ball-shaped rotator is rotatably held between the grooves, and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator. A bearing, wherein the rotating shaft portion is fitted to the inner periphery of the inner ring portion of the first bearing, and the outer ring portion is fixed to a frame. The radius or curvature of at least one of the cross-sections of the two grooves recessed in the inner ring portion and the outer ring portion of at least one of the two bearings is larger than the radius of the ball-shaped rotating body, and An outer ring portion of the second bearing is fixed at a position apart from the fixed position of the first bearing, while an end portion of the rotating shaft portion is in non-contact with an inner periphery of an inner ring portion of the second bearing. The second shaft is inserted and stretched, and An elastic member is always interposed between the end surface of the ring and the end face of the ring by being compressed in the longitudinal direction of the rotating shaft portion, and further, a ball is provided at an arbitrary position in the terminal direction of the rotating body extending perpendicular to the axial direction. Are rotatably disposed, and a guide frame having a groove for narrowly inserting the sphere is fixed to the frame.

According to the above configuration, the inner ring portion of the second bearing is pressed in the direction of the first bearing by the pressurization of the elastic member, and the end of the groove in the groove having a large radius or curvature connects the ball-shaped rotary member to the first bearing. By pressing in the direction of 1 bearing, the pressed ball-shaped rotating body moves to the groove end of the groove having a large radius or curvature of the second bearing outer ring portion and is pressed, whereby the gap in the second bearing disappears, In addition, the inner ring portion smoothly rotates with respect to the outer ring portion, and the rotating shaft portion is moved from the first bearing through the fixed groove end of the outer ring portion, the ball-shaped rotator, and the groove end of the inner ring portion. 2 Pressed in the direction toward the bearing.
Thus, the second bearing acts as a force transmission mechanism while maintaining the rotation function.

As a result, the groove end of the inner ring portion fitted to the rotating shaft portion of the first bearing in the groove having a large radius or curvature pushes the ball-shaped rotator in the direction of the second bearing, and the pressed ball. State in which the gap in the first bearing disappears and the inner ring rotates smoothly with respect to the outer ring, when the rotator moves to the groove end of the groove having a large radius or curvature of the first bearing outer ring. Becomes

On the other hand, the ball disposed at the end of the rotating body extending perpendicularly to the axial direction is narrowly inserted into the groove of the guide frame fixed to the frame. Are supported, and as a result, the bending of the rotating body due to its own weight or the like is reduced.

Further, even when a strong impact force is applied to the rotating body, the end of the rotating body is supported by the guide frame, so that vibration and deformation generated in the rotating body are suppressed. In this way, the ball and the guide frame guide the movement of the end of the rotating body, and also serve as a mechanism for improving impact resistance.

When the end of the rotating body moves along the groove of the guide frame, if the groove is not flat, the end of the rotating body is displaced up and down, thereby generating a force for tilting the rotating shaft. Since the rotating shaft portion is supported only by the first bearing, the inclination of the rotating shaft portion is within the allowable range of the grooves formed in the inner ring portion and the outer ring portion and the play portion formed by the ball-shaped rotating body. It is done without trouble. In addition, at this time, the second bearing is not in contact with the rotating shaft, so that the second bearing does not prevent the rotating shaft from being inclined. As described above, the first bearing functions as a mechanism for absorbing the inclination of the rotating shaft generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft.

Alternatively, the rotating shaft supporting method according to the present invention includes an inner ring portion, an outer ring portion, and a ball-shaped rotating body, wherein grooves are respectively formed on an outer periphery of the inner ring portion and an inner periphery of the outer ring portion. A first bearing in which the ball-shaped rotator is rotatably held between the grooves, and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator. A rotating body is provided, using a second bearing, fixing the outer ring portion of the first bearing to a frame, and extending, at the inner periphery of the inner ring portion of the first bearing, orthogonally to a longitudinal direction. In the rotating shaft supporting method for fitting a rotating shaft portion, a radius of a cross section of at least one of the grooves recessed in an inner ring portion and an outer ring portion of at least one of the first bearing and the second bearing. Or, make the curvature larger than the radius of the ball-shaped rotating body, and The outer ring portion of the second bearing is fixed at a position away from the fixed position of the first bearing, and the end of the rotating shaft portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner. And pressurizing the inner ring portion of the second bearing in the direction of the first bearing by the pressurizing by interposing a pressurizing means between the end portion and the end face of the inner ring portion, and A rotatable sphere disposed at an arbitrary position in the distal direction of the rotating body is guided by a guide frame fixed to the frame having a groove portion for inserting the sphere narrowly.

According to the above-described method, the inner ring portion of the second bearing is pressed in the direction of the first bearing by the pressurizing means, and the groove end in the groove having a large radius or curvature connects the ball-shaped rotary body to the first bearing. By pushing in the direction of the bearing, the pressed ball-shaped rotator moves to the groove end of the groove having a large radius or curvature of the second bearing outer ring portion and is pressed, the gap in the second bearing disappears, and The inner ring portion smoothly rotates with respect to the outer ring portion, and the rotating shaft portion moves from the first bearing to the second bearing portion via the groove end of the fixed outer ring portion, the ball-shaped rotating body, and the groove end of the inner ring portion. It is pressed in the direction toward the bearing. Thus, the second bearing functions to transmit the force while maintaining the rotation function.

As a result, the groove end of the inner ring portion fitted to the rotating shaft portion of the first bearing in the groove having a large radius or curvature pushes the ball-shaped rotator in the direction of the second bearing, and the pressed ball. State in which the gap in the first bearing disappears and the inner ring rotates smoothly with respect to the outer ring, when the rotator moves to the groove end of the groove having a large radius or curvature of the first bearing outer ring. Becomes

On the other hand, the ball disposed at the end of the rotating body extending perpendicular to the axial direction is movable along the groove while being held by the groove of the guide frame fixed to the frame. Accordingly, the end of the rotating body is supported by the guide frame, and as a result, the occurrence of bending of the rotating body due to its own weight or the like is reduced.

Further, even when a strong impact force is applied to the rotating body, the end of the rotating body is supported by the guide frame, so that vibration and deformation generated in the rotating body are suppressed. As described above, the ball and the guide frame serve to guide the movement of the end of the rotating body and to improve the impact resistance.

When the end of the rotating body moves along the groove of the guide frame, if the groove is not flat, the end of the rotating body is displaced up and down, thereby generating a force for tilting the rotating shaft. Since the rotating shaft portion is supported only by the first bearing, the inclination of the rotating shaft portion is within the allowable range of the grooves formed in the inner ring portion and the outer ring portion and the play portion formed by the ball-shaped rotating body. It is done without trouble. In addition, at this time, the second bearing is not in contact with the rotating shaft, so that the second bearing does not prevent the rotating shaft from being inclined. As described above, the first bearing functions to absorb the inclination of the rotating shaft portion generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft portion.

Alternatively, the rotating shaft support mechanism according to the present invention comprises a rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotator, each of which is provided on the outer periphery of the inner ring portion and the inner periphery of the outer ring portion. A groove is depressed, and the ball-shaped rotator is rotatably held between the two grooves,
The inner ring portion and the outer ring portion are provided with bearings configured to be mutually rotatable via the ball-shaped rotator, and the rotating shaft portion is fitted on an inner periphery of the inner ring portion, and the outer ring portion is provided. In a rotating shaft support mechanism in which a ring portion is fixed to a frame, a radius or a curvature of a cross section of at least one of the two grooves formed in the inner ring portion and the outer ring portion of the bearing is equal to or smaller than that of the ball-shaped rotating body. A sliding member having a central through portion is slidably disposed on an outer end face of the frame, which is larger than a radius and which is located in a longitudinal direction of the rotating shaft portion, and is slidably provided on the outer end face; The portion extends through the central through portion of the sliding member in contact or non-contact with the terminal portion extending therefrom, and an elastic member is provided between the distal end portion of the rotating shaft portion and the sliding member to extend the length of the rotating shaft portion. It is always compressed and interposed in the shaku direction.

According to the above configuration, the preload generated by the restoring force of the elastic member which is always compressed and interposed presses the rotating shaft in the direction opposite to the bearing side, and moves the rotating shaft. Let it. As a result, the groove end of the groove having a large radius or curvature of the inner ring portion of the bearing fitted to the rotating shaft portion pushes the ball-shaped rotator in the direction of the sliding member, and the pushed ball-shaped rotator becomes the bearing outer ring portion. Moves to the groove end of the groove having a large radius or curvature near the sliding member, the gap in the bearing is eliminated, and the inner ring portion can be smoothly rotated with respect to the outer ring portion.

When an external force or the like that inclines the rotating shaft acts on the rotating shaft, the rotating shaft is supported only by the bearings. Therefore, both the grooves of the inner ring and the outer ring and the play formed by the ball-shaped rotating body. The rotation shaft can be freely tilted within the range allowed by the portion.

Further, at this time, if the central through portion of the sliding member is not in contact with the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central through portion of the sliding member is not rotated by the rotating shaft portion. In the configuration in which the sliding member slides in the radial direction with the inclination of the rotating shaft portion,
Again, there is no obstruction when the rotating shaft is inclined.

As described above, the bearing functions as a mechanism for absorbing the inclination generated in the rotary shaft and smoothly rotating the rotary shaft. In addition, since only one bearing is used, a compact structure with low bulk in the axial direction is obtained.

Alternatively, the rotating shaft supporting method according to the present invention includes an inner ring portion, an outer ring portion, and a ball-shaped rotating body, wherein grooves are respectively formed in the outer periphery of the inner ring portion and the inner periphery of the outer ring portion. , The ball-shaped rotator is rotatably held between the grooves, and the inner ring portion and the outer ring portion are rotatable with each other via the ball-shaped rotator. In a rotating shaft supporting method in which a ring portion is fixed to a frame and a rotating shaft portion is fitted to the inner periphery of the inner ring portion, the method includes the steps of: forming a groove on the inner ring portion and the outer ring portion of the bearing; The radius or curvature of at least one of the cross sections is larger than the radius of the ball-shaped rotator, and the outer end face of the frame located in the direction of the rotation shaft portion elongate,
A sliding member having a central through portion is slidably disposed on the outer end surface and disposed, and a distal end portion of the rotating shaft portion is inserted into the central through portion of the sliding member in a contact or non-contact manner and extended, A pressurizing means is interposed between the end of the rotating shaft and the sliding member to press the sliding member against the outer end surface of the frame by the pressurization.

According to the above-described method, the pressurizing force generated by the pressurizing means presses the rotating shaft in the direction opposite to the bearing side to move the rotating shaft. As a result, the groove end of the groove having a large radius or curvature of the inner ring portion of the bearing fitted to the rotating shaft portion pushes the ball-shaped rotator in the direction of the sliding member, and the pushed ball-shaped rotator becomes the bearing outer ring portion. Moves to the groove end of the groove having a large radius or curvature near the sliding member, so that the gap in the bearing is eliminated and the inner ring can rotate smoothly with respect to the outer ring.

Here, when an external force or the like that inclines the rotary shaft portion acts, the rotary shaft portion is supported only by the bearing, so that both the grooves of the inner ring portion and the outer ring portion and the play formed by the ball-shaped rotating body. The rotation shaft can be freely tilted within the range permitted by the portion.

Further, at this time, when the central penetrating portion of the sliding member is not in contact with the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member is connected to the rotating shaft portion. In the case of contact with the portion, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft portion, and thus does not become an obstacle when the rotating shaft portion is inclined.

As described above, the bearing functions to absorb the inclination generated in the rotating shaft portion and to smoothly rotate the rotating shaft portion. In addition, since only one bearing is used, a compact structure with low bulk in the axial direction is obtained.

Alternatively, the rotating shaft supporting mechanism according to the present invention comprises a rotating shaft portion, a rotating body extending perpendicular to the longitudinal direction of the rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotating body. Grooves are respectively provided on the outer periphery of the inner ring portion and the inner periphery of the outer ring portion,
The ball-shaped rotator is rotatably held between the two grooves, and the inner ring portion and the outer ring portion include a bearing configured to be mutually rotatable via the ball-shaped rotator, In a rotating shaft support mechanism in which the rotating shaft portion is fitted to an inner periphery of an inner ring portion, and the outer ring portion is fixed to a frame, the rotating shaft portion is provided on the inner ring portion and the outer ring portion of the bearing. The sliding member having a central through portion on an outer end surface of the frame, in which a radius or a curvature of at least one of the grooves is larger than a radius of the ball-shaped rotator, and which is located in an elongated direction of the rotating shaft portion of the frame. The rotating shaft portion is disposed so as to be slidably in contact with an outer end surface, and the rotating shaft portion is inserted into the central through portion of the sliding member in a contact or non-contact manner, and a terminal portion extends, and the rotating shaft portion and the terminal portion of the rotating shaft portion are extended. An elastic member is constantly interposed between the sliding member and the sliding shaft in the longitudinal direction of the rotating shaft portion. A rotatable disk or ball is disposed at an arbitrary position in the terminal direction of the rotating body extending perpendicular to the longitudinal direction, and a guide strip that can abut the disk or ball is fixed to the frame. A pressurizing section provided with an elastic force for pressing the disk or ball in the direction of the guide strip is interposed between the end of the rotating body and the frame.

According to the above configuration, the preload generated by the restoring force of the elastic member which is always compressed and interposed presses the rotating shaft in the direction opposite to the bearing side to move the rotating shaft. Let it. As a result, the groove end of the groove having a large radius or curvature of the inner ring portion of the bearing fitted to the rotating shaft portion pushes the ball-shaped rotator in the direction of the sliding member, and the pushed ball-shaped rotator becomes the bearing outer ring portion. Moves to the groove end of the groove having a large radius or curvature near the sliding member, the gap in the bearing is eliminated, and the inner ring portion can be smoothly rotated with respect to the outer ring portion.

Here, when an external force or the like that inclines the rotating shaft portion acts, the rotating shaft portion is supported only by the bearing, so that both the grooves of the inner ring portion and the outer ring portion and the play formed by the ball-shaped rotating body. The rotation shaft can be freely tilted within the range allowed by the portion.

Further, at this time, in the configuration in which the central through portion of the sliding member is not in contact with the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central through portion of the sliding member is not rotated by the rotating shaft portion. In the configuration in which the sliding member slides in the radial direction with the inclination of the rotating shaft portion,
Again, there is no obstruction when the rotating shaft is inclined.

On the other hand, a disc or a sphere disposed at the end of the rotating body extending in the direction perpendicular to the axial direction is pressed by guide members fixed to the frame by the pressurizing portion. The end of the body is supported, and as a result, the occurrence of bending of the rotating body due to its own weight or the like is reduced.

When the end of the rotating body moves along the guiding strip, if the guiding strip is not flat, the end of the rotating body is displaced up and down, which generates a force for tilting the rotating shaft. Since the shaft portion is supported by the bearing so as to be tiltable as described above, the rotation shaft portion can be tilted without any trouble. Further, at this time, the sliding member does not hinder the inclination of the rotating shaft portion as described above. In this way, the bearing acts as a mechanism for absorbing the inclination of the rotating shaft generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft. In addition, since only one bearing is used, a compact structure with low bulk in the axial direction is obtained.

Alternatively, the rotating shaft supporting method according to the present invention comprises an inner ring portion, an outer ring portion, and a ball-shaped rotating body, wherein grooves are respectively formed on the outer periphery of the inner ring portion and the inner periphery of the outer ring portion. , The ball-shaped rotator is rotatably held between the grooves, and the inner ring portion and the outer ring portion are rotatable with each other via the ball-shaped rotator. A rotating shaft supporting method in which a ring portion is fixed to a frame, and a rotating shaft portion including a rotating body extending perpendicular to a longitudinal direction is fitted to an inner periphery of the inner ring portion. The outer end face of the frame, in which the radius or the curvature of at least one of the two grooves recessed in the outer ring portion is larger than the radius of the ball-shaped rotator, and is located in the direction of the rotation axis portion of the frame. A sliding member having a central through portion is slidably disposed on the outer end surface, and the rotating shaft portion is provided. The distal end of the rotary member is inserted into the central through portion of the sliding member in a contact or non-contact manner and extended, and a pressurizing means is interposed between the distal end of the rotating shaft and the sliding member. The sliding member is pressed against the outer end surface of the frame by pressurization, and a rotatable disk or sphere disposed at an arbitrary position in a distal direction of the rotating body is pressed by a pressurizing unit having elastic force. The guide strip fixed to the frame is pressed.

According to the above method, the pressurizing force generated by the pressurizing means presses the rotating shaft in the direction opposite to the bearing side to move the rotating shaft. As a result, the groove end of the groove having a large radius or curvature of the inner ring portion of the bearing fitted to the rotating shaft portion pushes the ball-shaped rotator in the direction of the sliding member, and the pushed ball-shaped rotator becomes the bearing outer ring portion. Moves to the groove end of the groove having a large radius or curvature near the sliding member, the gap in the bearing is eliminated, and the inner ring portion can be smoothly rotated with respect to the outer ring portion.

Here, when an external force or the like that inclines the rotary shaft portion acts, the rotary shaft portion is supported only by the bearing, so that both the grooves of the inner ring portion and the outer ring portion and the play formed by the ball-shaped rotating body. The rotation shaft can be freely tilted within the range allowed by the portion.

Further, at this time, when the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member is connected to the rotating shaft portion. In the case of contact with the portion, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft portion, so that there is no obstacle to the inclination of the rotating shaft portion.

On the other hand, a disc or a sphere disposed at the end of the rotating body extending perpendicularly to the axial direction is pressed by a pressurizing section against a guide strip fixed to the frame, and is rotated by the guide strip. The end of the body is supported, and as a result, the occurrence of bending of the rotating body due to its own weight or the like is reduced.

When the end of the rotating body moves along the guiding strip, if the guiding strip is not flat, the end of the rotating body is displaced up and down, thereby generating a force for tilting the rotating shaft. Since the shaft portion is supported by the bearing so as to be tiltable as described above, the rotation shaft portion can be tilted without any trouble. Further, at this time, the sliding member does not hinder the inclination of the rotating shaft portion as described above. In this way, the bearing acts as a mechanism for absorbing the inclination of the rotating shaft generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft. In addition, since only one bearing is used, a compact structure with low bulk in the axial direction is obtained.

Alternatively, the rotating shaft supporting mechanism according to the present invention comprises a rotating shaft portion, a rotating body extending perpendicular to the longitudinal direction of the rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotating body. Grooves are respectively provided on the outer periphery of the inner ring portion and the inner periphery of the outer ring portion,
The ball-shaped rotator is rotatably held between the two grooves, and the inner ring portion and the outer ring portion include a bearing configured to be mutually rotatable via the ball-shaped rotator, In a rotating shaft support mechanism in which the rotating shaft portion is fitted to an inner periphery of an inner ring portion, and the outer ring portion is fixed to a frame, the rotating shaft portion is provided on the inner ring portion and the outer ring portion of the bearing. The sliding member having a central through portion on an outer end surface of the frame, in which a radius or a curvature of at least one of the grooves is larger than a radius of the ball-shaped rotator, and which is located in an elongated direction of the rotating shaft portion of the frame. The rotating shaft portion is disposed so as to be slidably in contact with an outer end surface, and the rotating shaft portion is inserted into the central through portion of the sliding member in a contact or non-contact manner, and a terminal portion extends, and the rotating shaft portion and the terminal portion of the rotating shaft portion are extended. An elastic member is constantly interposed between the sliding member and the sliding shaft in the longitudinal direction of the rotating shaft portion. A ball is rotatably disposed at an arbitrary position in a terminal direction of the rotating body extending orthogonally to the axial direction,
A guide frame having a groove for narrowly inserting the sphere is fixed to the frame.

According to the above configuration, the preload generated by the restoring force of the elastic member which is always compressed and interposed presses the rotating shaft in the direction opposite to the bearing, and moves the rotating shaft. Let it. As a result, the groove end of the groove having a large radius or curvature of the inner ring portion of the bearing fitted to the rotating shaft portion pushes the ball-shaped rotator in the direction of the sliding member, and the pushed ball-shaped rotator becomes the bearing outer ring portion. Moves to the groove end of the groove having a large radius or curvature near the sliding member, the gap in the bearing is eliminated, and the inner ring portion can be smoothly rotated with respect to the outer ring portion.

Here, when an external force or the like that inclines the rotary shaft portion acts, the rotary shaft portion is supported only by the bearing, and therefore the play formed by both the grooves of the inner ring portion and the outer ring portion and the ball-shaped rotating body. The rotation shaft can be freely tilted within the range allowed by the portion.

Further, at this time, if the center penetrating portion of the sliding member is not in contact with the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the center penetrating portion of the sliding member is rotated by the rotating shaft portion. In the configuration in which the sliding member slides in the radial direction with the inclination of the rotating shaft portion,
Again, there is no obstruction when the rotating shaft is inclined.

On the other hand, the sphere disposed at the end of the rotating body extending perpendicularly to the axial direction is narrowly inserted into the groove of the guide frame fixed to the frame. Are supported, and as a result, the bending of the rotating body due to its own weight or the like is reduced.

Further, even when a strong impact force is applied to the rotating body, the end of the rotating body is supported by the guide frame, so that vibration and deformation generated in the rotating body are suppressed. In this way, the ball and the guide frame guide the movement of the end of the rotating body, and also serve as a mechanism for improving impact resistance.

When the end of the rotating body moves along the groove of the guide frame, if the groove is not flat, the end of the rotating body is displaced up and down, thereby generating a force for tilting the rotating shaft. Since the rotating shaft is supported by the bearing so as to be tiltable as described above, the rotating shaft can be tilted without any trouble. Further, at this time, the sliding member does not hinder the inclination of the rotating shaft portion as described above. In this way, the bearing acts as a mechanism for absorbing the inclination of the rotating shaft generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft. In addition, since only one bearing is used, a compact structure with low bulk in the axial direction is obtained.

Alternatively, the rotating shaft supporting method according to the present invention comprises an inner ring portion, an outer ring portion, and a ball-shaped rotating body, wherein grooves are respectively formed in the outer periphery of the inner ring portion and the inner periphery of the outer ring portion. , The ball-shaped rotator is rotatably held between the grooves, and the inner ring portion and the outer ring portion are rotatable with each other via the ball-shaped rotator. A rotating shaft supporting method in which a ring portion is fixed to a frame, and a rotating shaft portion including a rotating body extending perpendicular to a longitudinal direction is fitted to an inner periphery of the inner ring portion. The outer end face of the frame, in which the radius or the curvature of at least one of the two grooves recessed in the outer ring portion is larger than the radius of the ball-shaped rotator, and is located in the direction of the rotation axis portion of the frame. A sliding member having a central through portion is slidably disposed on the outer end surface, and the rotating shaft portion The distal end of the rotary member is inserted into the central through portion of the sliding member in a contact or non-contact manner and extended, and a pressurizing means is interposed between the distal end of the rotating shaft and the sliding member. A groove is provided which presses the sliding member slidably against the outer end surface of the frame by pressurization, and narrowly inserts the rotatable sphere disposed at an arbitrary position in the distal direction of the rotating body. Then, guidance is provided by a guidance frame fixed to the frame.

According to the above-described method, the pressurization of the pressurizing means presses the rotating shaft in the direction opposite to the bearing side to move the rotating shaft. As a result, the groove end of the groove having a large radius or curvature of the inner ring portion of the bearing fitted to the rotating shaft portion pushes the ball-shaped rotator in the direction of the sliding member, and the pushed ball-shaped rotator becomes the bearing outer ring portion. Moves to the groove end of the groove having a large radius or curvature near the sliding member, the gap in the bearing is eliminated, and the inner ring portion can be smoothly rotated with respect to the outer ring portion.

Here, when an external force or the like that inclines the rotary shaft portion acts, the rotary shaft portion is supported only by the bearing, and therefore, the play formed by both the grooves of the inner ring portion and the outer ring portion and the ball-shaped rotating body. The rotation shaft can be freely tilted within the range allowed by the portion.

Further, at this time, when the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member is connected to the rotating shaft portion. In the case of contact with the portion, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft portion, so that there is no obstacle to the inclination of the rotating shaft portion.

On the other hand, the sphere disposed at the end of the rotating body extending perpendicularly to the axial direction is narrowly inserted into the groove of the guiding frame fixed to the frame. Are supported, and as a result, the bending of the rotating body due to its own weight or the like is reduced.

Further, even when a strong impact force is applied to the rotating body, the end of the rotating body is supported by the guide frame, so that vibration and deformation generated in the rotating body are suppressed. As described above, the ball and the guide frame serve to guide the movement of the end of the rotating body and to improve the impact resistance.

When the end of the rotating body moves along the groove of the guide frame, if the groove is not flat, the end of the rotating body is displaced up and down, thereby generating a force for tilting the rotating shaft. Since the rotating shaft is supported by the bearing so as to be tiltable as described above, the rotating shaft can be tilted without any trouble. Further, at this time, the sliding member does not hinder the inclination of the rotating shaft portion as described above. As described above, the bearing acts to absorb the inclination of the rotating shaft generated by the vertical displacement of the end of the rotating body while maintaining the rotating function of the rotating shaft. Moreover, since only one bearing is used, the axial bulk is reduced.

[0084]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiment described below is a part of a preferred embodiment of the present invention,
Although various limitations that are preferable in terms of the technical configuration are given, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIG. 1 shows a first embodiment of a rotating shaft support mechanism according to the present invention.
It is a sectional view showing the composition of an embodiment. FIG. 2 is similar to FIG.
FIG. 3 is a cross-sectional view showing a configuration of a first bearing 4 shown in FIG.

As shown in FIG. 1, the rotary shaft support mechanism A1 according to the present invention comprises a first bearing 4 fixedly provided on an upper peripheral surface and a lower peripheral surface of a through hole provided in a frame 10, respectively. And a second bearing 5, a rotating shaft 2 fitted on the inner periphery of the first bearing 4, a connecting portion 3 fixedly or integrally formed on an upper end of the rotating shaft 2, and an upper end of the connecting portion 3 A rotating body 11 fixedly or integrally formed with the rotating body 11.

As shown in FIGS. 1 and 2, the first bearing 4 comprises an outer ring 43, an inner ring 41, and a plurality of spherical rotating bodies 42. An inner peripheral groove 431 having an arc-shaped cross section is formed on the inner periphery of the outer ring portion 43 so as to make a round around the inner peripheral surface, and one edge of the inner peripheral groove 431 forms an upper edge 431a, and the other edge. Form a lower edge 431b. Further, the radius (or curvature) RC of the inner peripheral groove 431 is configured to be larger than the radius RA of the spherical rotating body 42.

On the other hand, on the outer periphery of the inner ring portion 41, an outer peripheral groove 411 having an arc-shaped cross section is formed so as to surround the outer peripheral surface.
One edge of 11 forms an upper edge 411a, and the other edge forms a lower edge 411b. Further, the radius (or curvature) RB of the outer peripheral groove 411 is
2 is larger than the radius RA.

Further, the plurality of spherical rotating bodies 42 are rotatably inserted between the inner peripheral groove 431 of the outer ring 43 and the outer peripheral groove 411 of the inner ring 41. Thereby, one of the outer ring portion 43 and the inner ring portion 41 can smoothly rotate with respect to the other.

Further, when the spherical rotating body 42 is located in contact with the substantially central portion of one of the inner circumferential groove 431 and the outer circumferential groove 411, the spherical rotating body 42 and the other groove, that is, the outer circumferential groove 411
Alternatively, a radial gap g is formed between the inner peripheral groove 431 and the inner peripheral groove 431 as shown in FIG.

Next, as shown in FIG. 1, the second bearing 5 comprises an outer ring portion 53, an inner ring portion 51, and a plurality of spherical rotating bodies 52. An inner peripheral groove 531 having an arc-shaped cross section is formed on the inner periphery of the outer ring portion 53 so as to extend around the inner peripheral surface.
One edge forms an upper edge 531a and the other edge forms a lower edge 531b. Further, the radius (or curvature) of the inner circumferential groove 531 is configured to be larger than the radius of the spherical rotating body 52.

An outer peripheral groove 511 having an arc-shaped cross section is formed on the outer periphery of the inner ring portion 51 so as to extend around the outer peripheral surface.
One edge forms an upper edge 511a and the other edge forms a lower edge 511b. Further, the radius (or curvature) of the outer peripheral groove 511 is configured to be larger than the radius of the spherical rotating body 52.

The outer ring 43 of the first bearing 4 is fixed to the upper end of the through hole of the frame 10, and the rotation shaft 2 is fitted on the inner periphery of the inner ring 41. Therefore, when the rotating shaft portion 2 rotates about the rotating shaft Ax, the inner ring portion 41 of the first bearing 4 also rotates, and at this time, the plurality of spherical rotating bodies 42 have both the inner circumferential groove 431 and the outer circumferential groove 411. Rotate in contact with.

On the other hand, the outer ring portion 53 of the second bearing 5 is fixed to the lower end side of the through hole of the frame 10, but the diameter of the inner circumference of the inner ring portion 51 is larger than the diameter of the rotating shaft portion 2. Is configured. Therefore, the inner periphery of the inner ring portion 51 is not in contact with the rotating shaft portion 2, and a gap 6 is formed between the inner periphery of the inner ring portion 51 and the rotating shaft portion 2.

Further, an annular connecting portion 7 is disposed in contact with the lower end of the inner ring portion 51. The diameter of the inner circumference of the connecting portion 7 is configured to be larger than the diameter of the rotating shaft portion 2. Therefore, the inner periphery of the connection portion 7 is not in contact with the rotating shaft portion 2, and the gap 6 is formed between the inner periphery of the connecting portion 7 and the rotating shaft portion 2 as described above.

The rotary shaft 2 is inserted through the inner periphery of the inner ring 51 in a non-contact manner as described above, and further inserted through the annular connecting portion 7 in contact with the lower end of the inner ring 51 in a non-contact manner. It is extended, and a flange 9 protruding in the radial direction is fixed to the end thereof. An elastic member 8 such as a coil spring is interposed between the flange 9 and the connecting portion 7 as an elastic member.

Here, the elastic body 8 is always in a compressed state while being interposed between the flange 9 and the connecting portion 7.
Therefore, the elastic force which is going to be restored by the extension always acts between the flange 9 and the connecting portion 7.

The rotating shaft support mechanism A1 configured as described above
Will be described in detail below. When the elastic body 8 presses the connecting portion 7 in the direction from the second bearing 5 to the first bearing 4 (+ Z direction) by pressurization, the inner ring portion 51 of the second bearing 5 is pressed in the + Z direction and moves in the + Z direction. Moving. By the movement of the inner ring 51, the arc-shaped outer peripheral groove 511 provided on the inner ring 51 also moves in the + Z direction.
With the movement, the surface of the outer peripheral groove 511 protrudes in the radial direction, and the gap between the outer peripheral groove 511 and the ball-shaped rotating body 52 is first filled. Then, when the movement further proceeds, the lower edge 511b, which is the groove end in the −Z direction, comes into contact with the ball-shaped rotating body 52, and the lower edge 511b pushes the ball-shaped rotating body 52 in the + Z direction.

The ball-shaped rotator 52 pushed in the + Z direction moves along the inner peripheral groove 531 of the outer ring portion 53 of the second bearing 5.
The gap between the inner peripheral groove 531 that moves toward the upper edge 531a, which is the groove end near the first bearing, and protrudes relatively is filled. As you move further,
The upper edge 511a, which is the end of the groove in the Z direction, is
2, and the upper edge 511a pushes the ball-shaped rotating body 52 in the −Z direction due to the reaction.

The above operation will be described in further detail. When the gap around the ball-shaped rotator 52 is sufficiently large, the ball-shaped rotator 52 is moved to the lower edge 511b and the upper edge 531 as described above.
When the gap around the ball-shaped rotator 52 is narrower than this, the ball-shaped rotator 52 is positioned on the surface of the outer circumferential groove 511 until reaching the lower edge 511b. An appropriate position and the inner circumferential groove 53 up to the upper edge 531a
It will be pinched both in contact with the appropriate position on the first surface.

In any case, as described above, the gap between the two grooves 511 and 531 of the second bearing 5 and the ball-shaped rotator 52 is eliminated, and in this state, the ball-shaped rotator 52 is smoothly moved. Since the inner ring 51 is rotatable, it can be smoothly rotated with respect to the outer ring 53 to which the inner ring 51 is fixed.

Here, due to the reaction, the rotating shaft 2 is reversed, and the upper edge 531a of the fixed outer ring 53 is reversed.
(Or the inner circumferential groove 531 up to the upper edge 531a)
−Z direction through the ball-shaped rotator 52 and the lower edge 511b of the inner ring portion 51 (or an appropriate position on the outer peripheral groove 511 surface reaching the lower edge 511b). Is pressed. Thus, the second bearing 5 functions as a force transmission mechanism while maintaining the rotation function.

As a result, when the rotating shaft portion 2 moves in the -Z direction, the inner ring portion 41 of the first bearing 4 fitted to the rotating shaft portion 2 moves in the -Z direction. By the movement of the inner ring 41, the arc-shaped outer groove 411 provided on the inner ring 41 also moves in the -Z direction, so that the surface of the outer groove 411 protrudes in the radial direction with the movement, and first the ball The gap between the rotator 42 is filled. Then, as the movement further proceeds, the upper edge 4 which is the groove end in the + Z direction
11a comes into contact with the ball-shaped rotator 42, and the upper edge 411a pushes the ball-shaped rotator 42 in the -Z direction.

The ball-shaped rotator 42 pressed in the −Z direction moves along the inner circumferential groove 431 of the outer ring 43 of the first bearing 4.
Lower edge 431b which is the groove end near the second bearing 5
The gap between the inner peripheral groove 431 that moves in the direction and relatively protrudes is filled. As you move further,
The lower edge 431b, which is the groove end in the -Z direction, comes into contact with the ball-shaped rotating body 42, and the lower edge 431b pushes the ball-shaped rotating body 42 in the + Z direction by a reaction.

The above operation will be described in more detail. When the gap around the ball-shaped rotator 42 is sufficiently large, the ball-shaped rotator 42 has the lower edge 431b and the upper edge 411 as described above.
When the gap around the ball-shaped rotator 42 is narrower than this, the ball-shaped rotator 42 is placed on the surface of the inner circumferential groove 431 until it reaches the lower edge 431b. And the outer peripheral groove 41 up to the upper edge 411a.
It will be pinched both in contact with the appropriate position on the first surface.

In any case, as described above, the gap between the grooves 411 and 431 of the first bearing 4 and the ball-shaped rotator 42 is eliminated, and in this state, the ball-shaped rotator 42 is smoothly moved. Since the inner ring 41 is rotatable, the inner ring 41 can rotate smoothly with respect to the outer ring 43 to which the inner ring 41 is fixed. Therefore, the rotating shaft portion 2 fitted only to the inner ring portion 41 of the first bearing 4 can rotate smoothly.

Here, when an external force or the like for inclining acts on the rotating shaft 2, the rotating shaft 2 is supported only by the inner ring 41 of the first bearing 4. The rotation shaft 2 is freely tilted within a range allowed by a gap (play portion) formed by both grooves of the portion 43 and the ball-shaped rotator 42. Moreover, at this time, since the second bearing 5 is not in contact with the rotating shaft 2, the inclination of the rotating shaft 2 is not hindered by the second bearing 5.

For example, in FIG. 1, even if the rotating shaft of the rotating shaft portion 2 is inclined by the angle θ + or θ− as shown by the reference symbol Ax1 or Ax2, the air gap between the second bearing 5 and the rotating shaft portion 2 is increased. Due to the presence of the part 6, the rotation shaft part 2
Does not collide with the second bearing 5. In addition, with the inclination of the rotating shaft portion 2, the holding position of the ball-shaped rotating body 42 in the first bearing 4 changes, and a smooth rotating function is maintained. As described above, the first bearing functions as a mechanism for absorbing the inclination generated in the rotating shaft portion while maintaining the rotation. Similarly, the holding position of the ball-shaped rotating body 52 in the second bearing 5 changes with the inclination of the rotating shaft portion 2 to maintain the function of transmitting the preload while rotating.

To summarize the above operation, the inner rings 41 and 51 of the bearings 4 and 5 move in the -Z direction or + Z direction due to the preload of the elastic body 8 which is to be restored by the extension, and the ball-shaped rotation is performed. The bodies 42 and 52 are connected to each inner ring 41, 51
Between the outer ring portions 43 and 53 without any gap and rotatably. At this time, since the rotating shaft 2 is fitted only to the inner ring 41 of the first bearing 4, the rotating shaft 2 can be inclined, and the second bearing 5 is not in contact with the rotating shaft 2,
In addition, since a sufficient gap 6 is provided between the second bearing 5 and the rotating shaft 2, the inclination is not hindered by the second bearing 5. Also, according to the inclination of the rotating shaft 2,
The positions of the grooves where the ball-shaped rotating bodies 42 and 52 contact each other move to the equilibrium point. However, the elastic body 8 is always rotatably pinched without any gap by the constant preload.

As described above, since the radius or curvature of each groove provided in the first and second bearings 4 and 5 is larger than the radius of the spherical rotating bodies 42 and 52, the inner ring portion is formed. Even if there is a slight inclination between 41 and the outer ring 43 or between the inner ring 51 and the outer ring 53, it is possible to rotate accurately. As a result, the rotating shaft portion 2 is rotatably supported by one bearing, that is, the first bearing 4, and the first bearing 4
By using the inclination angle of the second bearing, it is possible to incline while rotating, and also by using the inclination angle of the second bearing, the elastic body 8 can apply a reasonable pressurization even during the rotation.

Next, in the first embodiment of the rotating shaft supporting method according to the present invention, in FIG. 1, a ball-shaped rotating body 42 and an outer circumferential groove 411 having a curvature larger than the radius of the ball-shaped rotating body 42 are provided. A first bearing 4 including an outer ring portion 43 having an inner peripheral groove 431 having a curvature larger than the radius of the ring portion 41 and the ball-shaped rotator 42 and rotatably holding the ball-shaped rotator 42 between both grooves. And the inner ring portion 51 provided with the ball-shaped rotating body 52 and the outer circumferential groove 511 having a curvature larger than the radius of the ball-shaped rotating body 52 and the inner circumferential groove 531 having a larger curvature than the radius of the ball-shaped rotating body 52.
The outer ring portion 43 of the first bearing 4 is fixed to the frame 10 using the second bearing 5 having the outer ring portion 53 having The rotating shaft portion 2 is fitted to the inner periphery of the inner ring portion 41, and the outer ring portion 5 of the second bearing 5 is located at a position away from the fixed position of the first bearing 4.
3 is fixed, and the end of the rotating shaft 2 is inserted into the inner periphery of the inner ring portion 51 of the second bearing 5 in a non-contact manner and stretched, and the end of the rotating shaft 2 and the inside of the second bearing 5 are extended. An elastic body 8 as a pressurizing means is interposed between the end faces of the ring portion 51, and the inner ring portion 51 of the second bearing 5 is moved by the pressurization to the first bearing 4.
In this direction.

The operation according to the first embodiment of the rotating shaft supporting method is the same as the operation of the first embodiment of the rotating shaft supporting mechanism according to the present invention, and therefore the description is omitted.

FIG. 3 shows a second embodiment of the rotary shaft support mechanism according to the present invention.
It is a sectional view of an embodiment. As shown in the figure, the rotating shaft support mechanism A2 according to the present invention includes a first bearing 4 and a second bearing 4 fixed to the upper end side peripheral surface and the lower end side peripheral surface of a through hole provided in the frame 10, respectively. A bearing 5, a rotating shaft portion 2 fitted on the inner periphery of the first bearing 4, a connecting portion 3 fixedly or integrally formed on an upper end of the rotating shaft portion 2, and a fixing portion on an upper end of the connecting portion 3. Alternatively, the rotating body 11 is integrally formed.

The first bearing 4 comprises an outer ring 43, an inner ring 41, and a plurality of spherical rotating bodies. An inner peripheral groove 431 having an arc-shaped cross section is formed on the inner periphery of the outer ring portion 43 so as to make a round around the inner peripheral surface, and both ends of the inner peripheral groove 431 form edges. Further, the radius of the inner circumferential groove 431 is configured to be larger than the radius of the spherical rotating body 42.

On the other hand, on the outer periphery of the inner ring portion 41, an outer peripheral groove 411 having an arc-shaped cross section is formed so as to surround the outer peripheral surface.
Both ends of 11 form an edge. Furthermore, the outer peripheral groove 41
The radius of 1 is larger than the radius of the spherical rotating body 42.

Further, the plurality of spherical rotating bodies 42 are rotatably inserted between the inner peripheral groove 431 of the outer ring 43 and the outer peripheral groove 411 of the inner ring 41. Thereby, one of the outer ring portion 43 and the inner ring portion 41 can smoothly rotate with respect to the other. Moreover, when the spherical rotator 42 is positioned in contact with the substantially central portion of one of the inner peripheral groove 431 and the outer peripheral groove 411, the spherical rotator 42 and the other groove, that is, the outer peripheral groove 411 or the inner peripheral groove 431 are disposed. A gap is formed.

Next, the second bearing 5 comprises an outer ring 53, an inner ring 51 and a plurality of spherical rotating bodies 52. An inner peripheral groove 531 having an arc-shaped cross section is formed on the inner periphery of the outer ring portion 53 so as to extend around the inner peripheral surface, and both ends of the inner peripheral groove 531 form edges. Further, the radius of the inner circumferential groove 531 is
2 is larger than the radius.

An outer peripheral groove 511 having an arc-shaped cross section is formed on the outer periphery of the inner ring portion 51 so as to extend around the outer peripheral surface.
Both ends of 1 form an edge. Further, an outer peripheral groove 511
Is larger than the radius of the spherical rotating body 52.

The outer ring 43 of the first bearing 4 is fixed to the upper end of the through hole of the frame 10, and the rotation shaft 2 is fitted on the inner periphery of the inner ring 41. Therefore, when the rotating shaft portion 2 rotates about the rotating shaft Ax, the inner ring portion 41 of the first bearing 4 also rotates, and at this time, the plurality of spherical rotating bodies 42 have both the inner circumferential groove 431 and the outer circumferential groove 411. Rotate in contact with.

On the other hand, the outer ring portion 53 of the second bearing 5 is fixed to the lower end side of the through hole of the frame 10, but the diameter of the inner circumference of the inner ring portion 51 is larger than the diameter of the rotating shaft portion 2. Is configured. Therefore, the inner periphery of the inner ring portion 51 is not in contact with the rotating shaft portion 2, and a gap 6 is formed between the inner periphery of the inner ring portion 51 and the rotating shaft portion 2.

Further, in contact with the lower end of the inner ring portion 51, an annular connecting portion 7 having an inner diameter larger than the diameter of the rotating shaft portion 2 is provided. Therefore, the inner periphery of the connecting portion 7 is not in contact with the rotating shaft portion 2, and the inner periphery of the connecting portion 7 is not in contact with the rotating shaft portion 2.
A gap 6 is formed between the gaps as described above.

As described above, the rotating shaft portion 2 extends further by inserting the inner ring portion 51 and the connecting portion 7 in a non-contact manner, and a flange 9 protruding in the radial direction is fixed to the end of the rotating shaft portion 2. . Further, an elastic member 8 made of a coil spring or the like is interposed between the flange 9 and the connecting portion 7 as an elastic member, and the elastic member 8 is constantly compressed between the flange 9 and the connecting portion 7, and is therefore always restored. The elastic force to be applied acts between the flange 9 and the connecting portion 7.

Further, a roller 12 is disposed at the end 11A of the arm extending perpendicularly to the direction of the rotation axis Ax of the rotating body 11 with its rotating axis directed in the radial direction of the rotating body 11. The roller 12 may be a rotatable sphere or a thinner disk. Further, the position of the roller 12 is not limited to the end of the rotating body 11, but may be an arbitrary position on the way from the rotation axis Ax to the end.

On the other hand, a rail 13 as a guide strip is fixedly mounted on the frame 10 so as to be able to contact the roller 12.
The three orbits form an arc or circle. Further, in order to press the roller 12 against the rail 13, a coil spring 14 is mounted between the end of the rotating body 11 and the frame 10 as a pressurizing section having elastic force. An elastic material such as rubber or an elastomer can be applied to the pressurizing portion in addition to the coil spring 14. Furthermore, it is also possible to adopt a configuration in which a magnet and another magnet or paramagnetic body facing the magnet are mounted on either the rotating body 11 side or the frame 10 side, and pressurization is applied by magnetic force. .

The structure in which one end is connected to the frame 10 such as the coil spring 14 as the pressurizing portion is the same as that of the rotating body 1.
One rotation range is relatively narrow and limited, and is suitable for the case of rotating in the forward direction and the reverse direction within this range, that is, the case of rotating. On the other hand, in the configuration of the pressurizing section by the magnetic force, the structure is uncoupled, so that the rotation range is not limited, and therefore, it is suitable for operation at any rotation angle or rotation angle including 360-degree rotation.

FIG. 4 is a sectional view of the rotary shaft support mechanism A2 shown in FIG.
FIG. 6 is a cross-sectional view illustrating an operation when a tilt occurs. Hereinafter, the operation of the rotary shaft support mechanism A2 will be described with reference to FIGS. When the rotating shaft portion 2 and the rotating body 11 rotate or rotate by a rotation driving means (not shown) such as a motor or an electromagnetic actuator, the roller 12 at the end of the rotating body 11 rotates while being pressed against the rail 13 by the coil spring 14, and rotates. The 11 end moves along the rail 13. Thus, the rotating body 11
The end is supported by a rail 13 fixed to the frame, and as a result, the occurrence of bending of the rotating body 11 due to its own weight or the like is reduced.

At this time, if the surface height of the rail 13 is not flat and is wavy, for example,
2 traces, and the end of the rotating body 11 is displaced up and down. This vertical displacement causes the rotating body 11 to incline to apply an inclining force to the rotating shaft 2.

On the other hand, the elastic body 8 presses the inner ring portion 51 of the second bearing 5 in the direction of the first bearing 4 by the pressurization, and the groove end of the outer peripheral groove 511 pushes the ball-shaped rotating body 52 in the direction of the first bearing 4. When the pressed ball-shaped rotator 52 moves toward the groove end of the inner circumferential groove 531 of the outer ring portion 53 of the second bearing 5, the gap in the second bearing 5 disappears and the inner ring portion 51 smoothly rotates with respect to the outer ring 53, and the inner circumferential groove 531 of the outer ring 53 is fixed.
The rotating shaft portion 2 is pressed in a direction from the first bearing 4 to the second bearing 5 through the surface or groove end of the ball-shaped rotator 52 and the surface or groove end of the outer peripheral groove 511 of the inner ring portion 51. Thus, the second bearing 5 operates as a force transmission mechanism while maintaining the rotation function.

As a result, the rotating shaft 2 of the first bearing 4
The groove end of the outer peripheral groove 411 of the inner ring portion 41 fitted to the outer ring portion 41 of the first bearing 4 pushes the ball-shaped rotator 42 in the direction of the second bearing 5. The inner circumferential groove 431 moves in the groove end direction, the gap in the first bearing 4 disappears, and the inner ring 41 smoothly rotates with respect to the outer ring 43.

As described above, when the end of the rotating body 1 is displaced up and down and a tilting force is applied to the rotating shaft 2, the rotating shaft 2 is attached to the inner ring 41 of the first bearing 4. The rotation axis Ax1 is tilted within the allowable range of both the grooves of the inner ring 41 and the outer ring 43 and the gap (play portion) formed by the ball-shaped rotator 42, so that the rotation axis Ax1 is inclined. 2 is inclined by an angle θ +. Moreover, at this time, since the second bearing 5 is not in contact with the rotating shaft 2, the inclination of the rotating shaft 2 is not hindered by the second bearing 5.

As described above, since the first bearing 4 absorbs the inclination of the rotating shaft 2 generated by the vertical displacement of the end of the rotating body 11 while maintaining the rotating function of the rotating shaft 2, the rail 13 is flat. However, even if there is an error, the rotation shaft 2 is inclined to follow this, and smooth rotation is maintained.

Further, even in the case where a step or a wavy portion is intentionally provided on the rail 13 for a predetermined purpose, according to the structure of the present embodiment, it is possible to accurately follow the step or the waving, and It is possible to maintain smooth rotation while tilting.

FIG. 5 is a sectional view of an example of a guide roller applied to the rotary shaft support mechanism according to the present invention. In FIG. 4, when the rotating body 11 is tilted, the roller 12 is also tilted and comes into contact with the rail 13 with the edge 12a. Therefore, if a roller 15 having a crowning surface with a curvature Rc as shown in FIG. 5 is used, the surface of the roller 15 comes into contact with the surface of the rail 13 without fail, and the rotation accuracy is further improved.

Next, in the second embodiment of the rotating shaft supporting method according to the present invention, in FIG. 3, a ball-shaped rotating body 42 and an outer circumferential groove 411 having a curvature larger than the radius of the ball-shaped rotating body 42 are provided. A first bearing 4 including an outer ring portion 43 having an inner peripheral groove 431 having a curvature larger than the radius of the ring portion 41 and the ball-shaped rotator 42 and rotatably holding the ball-shaped rotator 42 between both grooves. And the inner ring portion 51 provided with the ball-shaped rotating body 52 and the outer circumferential groove 511 having a curvature larger than the radius of the ball-shaped rotating body 52 and the inner circumferential groove 531 having a larger curvature than the radius of the ball-shaped rotating body 52.
The outer ring portion 43 of the first bearing 4 is fixed to the frame 10 using the second bearing 5 having the outer ring portion 53 having The rotating shaft portion 2 is fitted to the inner periphery of the inner ring portion 41, and the outer ring portion 5 of the second bearing 5 is located at a position away from the fixed position of the first bearing 4.
3 is fixed, and the end of the rotating shaft 2 is inserted into the inner periphery of the inner ring portion 51 of the second bearing 5 in a non-contact manner and stretched, and the end of the rotating shaft 2 and the inside of the second bearing 5 are extended. An elastic body 8 as a pressurizing means is interposed between the end faces of the ring portion 51, and the inner ring portion 51 of the second bearing 5 is moved by the pressurization to the first bearing 4.
, And a rotatable roller 12 disposed at an arbitrary position in the distal direction of the rotating body 11 is fixed to the frame 10 by a coil spring 14 as a pressurizing section having elastic force. To be pressed against the rail 13 as the main body.

The operation of the rotary shaft supporting method according to the second embodiment is the same as the operation of the rotary shaft supporting mechanism according to the second embodiment of the present invention, and therefore the description thereof is omitted.

FIG. 6 shows a third embodiment of the rotary shaft supporting mechanism according to the present invention.
It is a sectional view of an embodiment. As shown in the figure, the rotating shaft support mechanism A3 according to the present invention includes a first bearing 4 and a second bearing 4 fixed to the upper end side peripheral surface and the lower end side peripheral surface of a through hole provided in the frame 10, respectively. A bearing 5, a rotating shaft portion 2 fitted on the inner periphery of the first bearing 4, a connecting portion 3 fixedly or integrally formed on an upper end of the rotating shaft portion 2, and a fixing portion on an upper end of the connecting portion 3. Alternatively, it has a rotating body 15 formed integrally.

The first bearing 4 comprises an outer ring 43, an inner ring 41, and a plurality of spherical rotating bodies. An inner peripheral groove 431 having an arc-shaped cross section is formed on the inner periphery of the outer ring portion 43 so as to make a round around the inner peripheral surface, and both ends of the inner peripheral groove 431 form edges. Further, the radius of the inner circumferential groove 431 is configured to be larger than the radius of the spherical rotating body 42.

On the other hand, on the outer periphery of the inner ring portion 41, an outer peripheral groove 411 having an arc-shaped cross section is formed so as to surround the outer peripheral surface.
Both ends of 11 form an edge. Furthermore, the outer peripheral groove 41
The radius of 1 is larger than the radius of the spherical rotating body 42.

Further, the plurality of spherical rotating bodies 42 are rotatably inserted between the inner peripheral groove 431 of the outer ring 43 and the outer peripheral groove 411 of the inner ring 41. Thereby, one of the outer ring portion 43 and the inner ring portion 41 can smoothly rotate with respect to the other. Moreover, when the spherical rotator 42 is positioned in contact with the substantially central portion of one of the inner peripheral groove 431 and the outer peripheral groove 411, the spherical rotator 42 and the other groove, that is, the outer peripheral groove 411 or the inner peripheral groove 431 are disposed. A gap is formed.

Next, the second bearing 5 comprises an outer ring 53, an inner ring 51, and a plurality of spherical rotating bodies 52. An inner peripheral groove 531 having an arc-shaped cross section is formed on the inner periphery of the outer ring portion 53 so as to extend around the inner peripheral surface, and both ends of the inner peripheral groove 531 form edges. Further, the radius of the inner circumferential groove 531 is
2 is larger than the radius.

On the outer periphery of the inner ring portion 51, an outer peripheral groove 511 having an arc-shaped cross section is formed so as to surround the outer peripheral surface.
Both ends of 1 form an edge. Further, an outer peripheral groove 511
Is larger than the radius of the spherical rotating body 52.

The outer ring 43 of the first bearing 4 is fixed to the upper end of the through hole of the frame 10, and the rotation shaft 2 is fitted on the inner periphery of the inner ring 41. Therefore, when the rotating shaft portion 2 rotates about the rotating shaft Ax, the inner ring portion 41 of the first bearing 4 also rotates, and at this time, the plurality of spherical rotating bodies 42 have both the inner circumferential groove 431 and the outer circumferential groove 411. Rotate in contact with.

On the other hand, the outer ring portion 53 of the second bearing 5 is fixed to the lower end side of the through hole of the frame 10, but the diameter of the inner circumference of the inner ring portion 51 is larger than the diameter of the rotating shaft portion 2. Is configured. Therefore, the inner periphery of the inner ring portion 51 is not in contact with the rotating shaft portion 2, and a gap 6 is formed between the inner periphery of the inner ring portion 51 and the rotating shaft portion 2.

Further, in contact with the lower end of the inner ring portion 51, an annular connecting portion 7 whose inner diameter is larger than the diameter of the rotating shaft portion 2 is provided. Therefore, the inner periphery of the connecting portion 7 is not in contact with the rotating shaft portion 2, and the inner periphery of the connecting portion 7 is not in contact with the rotating shaft portion 2.
A gap 6 is formed between the gaps as described above.

As described above, the rotating shaft portion 2 extends further by penetrating the inner ring portion 51 and the connecting portion 7 in a non-contact manner, and a flange 9 protruding in the radial direction is fixed to an end of the rotating shaft portion 2. . Further, an elastic member 8 made of a coil spring or the like is interposed between the flange 9 and the connecting portion 7 as an elastic member, and the elastic member 8 is constantly compressed between the flange 9 and the connecting portion 7, and is therefore always restored. The elastic force to be applied acts between the flange 9 and the connecting portion 7.

Further, a ball 16 is rotatably fitted to the distal end 15A of the arm extending perpendicular to the direction of the rotation axis Ax of the rotating body 15. The distal end 15A of the arm portion has a forked shape, and a concave spherical concave portion is formed on both inner sides, and the spherical surface 16 is slidably sandwiched between these two concave spherical surfaces.

On the other hand, a guide frame 17 having a groove 17a for allowing the ball 16 to be rotatably or slidably fitted and movable in the frame 10 is fixedly mounted with the ball 16 fitted in the groove 17a. I have. The trajectory of the groove 17a is
It forms an arc or circle and is capable of operation at any angle of rotation or rotation, including 360 degrees of rotation.

Next, the operation of the rotating shaft support mechanism A3 when the inclination occurs will be described. The rotating shaft 2 and the rotating body 1 are rotated by a rotating drive unit (not shown) such as a motor or an electromagnetic actuator.
5 rotates or rotates, the ball 16 fitted into the end 15a of the rotating body 15 rotates or slides, and the guide frame 1
7 also rotates or slides in the groove 17a,
To move smoothly. Thus, the end 15 of the rotating body 15
a is supported by the guide frame 17 fixed to the frame 10, and as a result, the occurrence of bending of the rotating body 15 due to its own weight or the like is reduced.

Further, the guide frame 17 has a U-shape and has a sphere 1 inside.
6, the ball 16 and the end 15a of the rotating body 15 do not deviate in the vertical direction. Therefore,
If the device is dropped onto the floor, etc., a strong impact
In addition, the vibration and deformation of the rotating body 15 that occurs can be suppressed, and damage to the device can be prevented.

On the other hand, if the height of the groove portion 17a of the guide frame 17 is not flat and is wavy, for example,
The trace 15a displaces the distal end 15a up and down. This vertical displacement causes the rotating body 15 to incline to apply an inclining force to the rotating shaft 2.

On the other hand, the elastic body 8 presses the inner ring portion 51 of the second bearing 5 in the direction of the first bearing 4 by the pressurization, and the groove end of the outer peripheral groove 511 pushes the ball-shaped rotating body 52 in the direction of the first bearing 4. When the pressed ball-shaped rotator 52 moves toward the groove end of the inner circumferential groove 531 of the outer ring portion 53 of the second bearing 5, the gap in the second bearing 5 disappears and the inner ring portion 51 smoothly rotates with respect to the outer ring 53, and the inner circumferential groove 531 of the outer ring 53 is fixed.
The rotating shaft portion 2 is pressed in a direction from the first bearing 4 to the second bearing 5 through the surface or groove end of the ball-shaped rotator 52 and the surface or groove end of the outer peripheral groove 511 of the inner ring portion 51. Thus, the second bearing 5 operates as a force transmission mechanism while maintaining the rotation function.

As a result, the rotating shaft 2 of the first bearing 4
The groove end of the outer peripheral groove 411 of the inner ring portion 41 fitted to the outer ring portion 41 of the first bearing 4 pushes the ball-shaped rotator 42 in the direction of the second bearing 5. The inner circumferential groove 431 moves in the groove end direction, the gap in the first bearing 4 disappears, and the inner ring 41 smoothly rotates with respect to the outer ring 43.

As described above, the end 1 of the rotating body 15
When the tilting force acts on the rotating shaft 2 due to the vertical displacement of 5 a, the rotating shaft 2 is supported only by the inner ring 41 of the first bearing 4. It inclines within the allowable range of the gap (play portion) formed by both grooves of the ring portion 43 and the ball-shaped rotating body 42. Moreover, at this time, since the second bearing 5 is not in contact with the rotating shaft 2, the inclination of the rotating shaft 2 is not hindered by the second bearing 5.

As described above, since the first bearing 4 maintains the rotation function of the rotating shaft portion 2 and absorbs the inclination of the rotating shaft portion 2 generated by the vertical displacement of the end of the rotating body 15, the guide frame 17 is formed. Even if there is an error due to the unevenness, the rotating shaft 2 is inclined to follow this, and smooth rotation is maintained.

In the case where the guide frame 17 is intentionally provided with a step or wavy portion for a predetermined purpose, the structure of the present embodiment can accurately follow the step or wavy portion, and the rotating shaft portion 2 can be moved. Correspondingly, it is possible to maintain smooth rotation while tilting.

Next, in the third embodiment of the rotating shaft supporting method according to the present invention, in FIG. 6, the ball-shaped rotating body 42 and the outer circumferential groove 411 having a curvature larger than the radius of the ball-shaped rotating body 42 are provided. A first bearing 4 including an outer ring portion 43 having an inner peripheral groove 431 having a curvature larger than the radius of the ring portion 41 and the ball-shaped rotator 42 and rotatably holding the ball-shaped rotator 42 between both grooves. And the inner ring portion 51 provided with the ball-shaped rotating body 52 and the outer circumferential groove 511 having a curvature larger than the radius of the ball-shaped rotating body 52 and the inner circumferential groove 531 having a larger curvature than the radius of the ball-shaped rotating body 52.
The outer ring portion 43 of the first bearing 4 is fixed to the frame 10 using the second bearing 5 having the outer ring portion 53 having The rotating shaft portion 2 is fitted to the inner periphery of the inner ring portion 41, and the outer ring portion 5 of the second bearing 5 is located at a position away from the fixed position of the first bearing 4.
3 is fixed, and the end of the rotating shaft 2 is inserted into the inner periphery of the inner ring portion 51 of the second bearing 5 in a non-contact manner and stretched, and the end of the rotating shaft 2 and the inside of the second bearing 5 are extended. An elastic body 8 as a pressurizing means is interposed between the end faces of the ring portion 51, and the inner ring portion 51 of the second bearing 5 is moved by the pressurization to the first bearing 4.
, And is rotatably inserted into a groove 17 a of a guide frame 17 to guide the rotatable sphere 16 fitted into an arbitrary position in the distal direction of the rotating body 15.

The operation according to the third embodiment of the rotating shaft supporting method is the same as the operation according to the third embodiment of the rotating shaft supporting mechanism of the present invention, and therefore the description is omitted.

FIG. 7 shows a fourth embodiment of the rotary shaft supporting mechanism according to the present invention.
It is a sectional view of an embodiment. As shown in the figure, a rotating shaft support mechanism A4 according to the present invention is fitted on a bearing 4 'fixed to a side peripheral surface of a through hole provided in a frame 10 and an inner periphery of the bearing 4'. And a connecting portion 3 ′ fixedly or integrally formed on the upper end of the rotating shaft portion 20.
And a rotating body 11 'fixedly or integrally formed at the upper end of the connecting portion 3'.

The rotating shaft portion 20 is rotatable about the rotating shaft Ax20, and the upward direction of the rotating shaft Ax20 when there is no inclination is +
When the Z direction and the downward direction of the rotation axis Ax20 are conveniently defined as the −Z direction, the sliding member 2 including the central through portion 23a slidably contacts the outer end surface 10a of the frame 10 in the −Z direction.
The rotating shaft 20 extends through the central through portion 23a in a contact or non-contact manner. The flange 9 protrudes in the radial direction at the end of the rotating shaft 20. An elastic body 8 such as a coil spring is interposed between the flange 9 and the sliding member 23 as an elastic member.

Further, the sliding auxiliary member 22 is attached or attached to at least one of the surface of the sliding member 23 on the side in contact with the outer end surface 10a of the frame 10 and the outer end surface 10a of the frame 10 on the side in contact with the sliding member 23. It can also be configured by pasting. As the slide assisting member 22, for example, a graphite-based lubricant or a lubricant such as tetra-fluoro-ethylene can be applied.

Here, the elastic body 8 includes the flange 9 and the sliding member 2.
In the state in which the elastic member is interposed between the three members, the elastic member is always in a compressed state, so that an elastic force which is to be restored by elongation is always applied between the flange 9 and the sliding member 23.

The bearing 4 'comprises an outer ring 43', an inner ring 41 ', and a plurality of spherical rotating bodies 42. Outer ring 4
An inner circumferential groove 431 ′ having an arc-shaped cross section is formed on the inner circumference of 3 ′ so as to extend around the inner circumferential surface, and the −Z direction edge of the inner circumferential groove 431 ′ forms a lower edge 431 b ′. I have. Furthermore, inner circumferential groove 4
The radius (or curvature) of 31 ′ is configured to be larger than the radius of the spherical rotating body 42.

On the other hand, on the outer periphery of the inner ring portion 41 ', an outer peripheral groove 411' having an arc-shaped cross section is formed so as to surround the outer peripheral surface, and the + Z direction edge of the outer peripheral groove 411 'forms an upper edge 411a'. are doing. Further, the radius (or curvature) of the outer peripheral groove 411 ′ is configured to be larger than the radius of the spherical rotating body 42.

Further, the plurality of spherical rotators 42 are provided with an inner peripheral groove 431 'of the outer ring 43' and an outer peripheral groove 41 of the inner ring 41 '.
It is rotatably inserted between 1 '. As a result, the inner ring 41 'can be smoothly rotated with respect to the outer ring 43'.

In addition, the spherical rotator 42 has the inner peripheral groove 431 '.
Alternatively, when the outer peripheral groove 411 ′ is positioned in contact with one substantially central portion of the outer peripheral groove 411 ′,
A gap is formed between the groove 11 'and the inner circumferential groove 431'.

The rotating shaft support mechanism A4 configured as described above
Will be described below. When the elastic body 8 presses the sliding member 23 in the + Z direction by pressurization, the sliding member 23 slidably comes into contact with the outer end surface 10a of the frame 10, and when the rotation shaft portion 20 moves in the -Z direction due to the reaction generated here, The inner ring portion 41 'of the bearing 4' fitted to the rotating shaft portion 20 moves in the -Z direction.

Due to the movement of the inner ring portion 41 ', the arc-shaped outer peripheral groove 411' provided in the inner ring portion 41 'also becomes -Z.
As a result, the surface of the outer circumferential groove 411 ′ protrudes outward in the radial direction with the movement, and firstly, the gap between the ball-shaped rotating body 42 is filled. Then, when the movement further proceeds, the upper edge 411a 'which is the groove end in the + Z direction is formed.
Comes into contact with the ball-shaped rotator 42 and the upper edge 41
1a 'pushes the ball-shaped rotating body 42 in the -Z direction.

The ball-shaped rotator 42 pressed in the -Z direction moves in the -Z direction along the inner circumferential groove 431 'of the outer ring 43' of the bearing 4 ', and relatively protrudes inward. The gap between the inner surface of the inner circumferential groove 431 ′ is filled. As the movement further proceeds, the lower edge 431b ', which is the groove end in the -Z direction of the outer ring portion 43', comes into contact with the ball-shaped rotating body 42, and reaches an equilibrium state.

The above operation will be described in further detail. When the gap around the ball-shaped rotator 42 is sufficiently large, the ball-shaped rotator 42 is moved to the lower edge 431b 'and the upper edge 41 as described above.
If the gap around the ball-shaped rotator 42 is smaller than this, the ball-shaped rotator 42 will be held in the inner circumferential groove 431 ′ until reaching the lower edge 431 b ′. And the appropriate position on the surface of the outer circumferential groove 411 'up to the upper edge 411a'.

In any case, as described above, there is no gap between the two grooves 411 ', 431' of the bearing 4 'and the ball-shaped rotator 42, and in this state, the ball-shaped rotator 42 becomes smooth. The inner ring part 4
1 'can be smoothly rotated with respect to the fixed outer ring 43'. Therefore, the inner ring 4 of the bearing 4 '
The rotation shaft portion 20 fitted to only 1 'can be smoothly rotated.

When an external force or the like for tilting acts on the rotating shaft 20, the rotating shaft 20 is supported only by the inner ring 41 'of the bearing 4'.
The rotation shaft portion 20 can be freely tilted within the allowable range of the gap (play portion) formed by both the groove of the outer ring portion 43 and the groove 1 'and the ball-shaped rotator 42. At the time of this inclination, as described in detail above, the position where the ball-shaped rotator 42 comes into contact with the surfaces of the inner peripheral groove 431 ′ and the outer peripheral groove 411 ′ under the state where the pressure is applied by the coil spring 8 which is an elastic body. In a state where the ball-shaped rotator 42 is in contact with both at an appropriate position and there is no backlash,
Moreover, it is held rotatably.

Further, at this time, if the central through portion 23a of the sliding member 23 is not in contact with the rotary shaft portion 20, there is a gap between the central through portion 23a and the rotary shaft portion 20.
The inclination of 0 is not hindered by the sliding member 23.

In the configuration in which the central through portion 23a of the sliding member 23 contacts the rotating shaft 20, the sliding member 23 slides in the radial direction with the inclination of the rotating shaft 20, so that the rotating shaft 20 is also inclined. It does not hinder you from doing so.

In both the contact and non-contact configurations described above, the end of the rotary shaft 20 including the flange 9 swings due to the inclination of the rotary shaft 20, so that the coil spring 8, which is an elastic body, is slightly deformed. The pressurization is continued even under slight deformation due to the characteristics of the elastic body.

As described above, the bearing 4 ′ is connected to the rotating shaft 20.
And acts as a mechanism for smoothly rotating the rotating shaft portion 20. Moreover, since only one bearing is used, it is possible to obtain a compact configuration with a low bulk in the axial direction.

To summarize the above operation, the inner ring portion 41 of the bearing 4 'moves in the -Z direction due to the preload of the coil spring 8, which is an elastic body, which is to be restored by extension.
The ball-shaped rotator 42 is rotatably held between the inner ring 41 'and the outer ring 43' without any gap. At this time, since the rotating shaft portion 20 is fitted only to the inner ring portion 41 ′ of the bearing 4 ′, the rotating shaft portion 20 can be tilted. Since it is free, the inclination of the rotating shaft portion 20 is not hindered by the sliding member 23. Also, according to the inclination of the rotating shaft portion 20,
The position of the groove with which the ball-shaped rotator 42 comes into contact moves to the equilibrium point, but is always rotatably held in the bearing 4 ′ without any gap by the constant preload of the elastic body 8.

As described above, since the radius or curvature of each groove provided in the bearing 4 'is configured to be larger than the radius of the spherical rotating body 42, the inner ring 41' and the outer ring 43 'are formed. Even if there is some inclination between them, it is possible to rotate accurately. As a result, the rotating shaft portion 20 is rotatably supported by the single bearing 4, and can be tilted while rotating by using the tilt angle of the bearing 4 ′. No pressurization can be applied.

Next, a fourth embodiment of the rotating shaft supporting method according to the present invention is provided with a ball-shaped rotating body 42 and an outer peripheral groove 411 'having a curvature larger than the radius of the ball-shaped rotating body 42 in FIG. An outer ring portion 43 'having an inner peripheral groove 431' having a curvature larger than the radius of the inner ring portion 41 'and the ball-shaped rotating body 42 is provided, and the ball-shaped rotating body 42 is rotatably held between both grooves. Using the bearing 4 ', the outer ring 43' of the bearing 4 'is fixed to the frame 10, and the rotation shaft 20 is provided on the inner periphery of the inner ring 41'.
And a sliding member 23 having a central through portion 23a is slidably disposed on the outer end surface 10a of the frame 10 on the outer end surface 10a, and the rotating shaft portion 20 is in contact with or not in contact with the central through portion 23a. The coil spring 8 serving as a pressurizing means is interposed between the end of the rotating shaft portion 20 and the sliding member 23, and the sliding member 23 is
0 is pressed against the outer end surface 10a.

The operation of the rotating shaft supporting method according to the fourth embodiment is the same as the above-described operation of the rotating shaft supporting mechanism according to the fourth embodiment of the present invention, and therefore the description thereof is omitted.

FIG. 8 shows a fifth embodiment of the rotary shaft supporting mechanism according to the present invention.
It is a sectional view of an embodiment. As shown in the figure, the rotating shaft support mechanism A5 according to the present invention has a bearing 4 'fixed to the side peripheral surface of a through hole provided in the frame 10, and fitted to the inner periphery of the bearing 4'. And a connecting portion 3 ′ fixedly or integrally formed on the upper end of the rotating shaft portion 20.
And a rotating body 11 ″ that is fixedly or integrally formed at the upper end of the connecting portion 3 ′ and extends in a direction orthogonal to the rotating shaft.

The rotating shaft portion 20 is rotatable about the rotating shaft Ax20.
When the Z direction and the downward direction of the rotation axis Ax20 are conveniently defined as the −Z direction, the sliding member 23 having a central through portion is slidably in contact with the outer end surface 10a of the frame 10 in the −Z direction, The rotating shaft portion 20 is extended by being inserted into the central through portion in a contact or non-contact manner, and a flange 9 protruding in a radial direction is fixed to an end of the rotating shaft portion 20. A coil spring 8 as an elastic body is interposed between the flange 9 and the sliding member 23 as an elastic member.

Further, at least one of the surface of the sliding member 23 on the side in contact with the outer end surface 10a of the frame 10 and the outer end surface 10a of the frame 10 on the side in contact with the sliding member 23, is provided with or attached with a sliding aid. It can also be configured by setting. As the sliding aid, for example, a graphite-based lubricant or a lubricant such as tetra-fluoro-ethylene can be used.

Here, the coil spring 8 is always in a compressed state in a state where it is interposed between the flange 9 and the sliding member 23, so that the elastic force which is to be restored by the extension is always between the flange 9 and the sliding member 23. It is configured to provide.

The bearing 4 'comprises an outer ring 43', an inner ring 41 ', and a plurality of spherical rotating bodies 42. Outer ring 4
An inner circumferential groove 431 'having an arc-shaped cross section is formed in the inner circumference of 3' so as to make a round around the inner circumferential surface, and an edge of the inner circumferential groove 431 'in the -Z direction forms a lower edge. Further, the radius (or curvature) of the inner peripheral groove 431 ′ is configured to be larger than the radius of the spherical rotating body 42.

On the other hand, on the outer periphery of the inner ring portion 41 ', an outer peripheral groove 411' having an arc-shaped cross section is formed so as to go around the outer peripheral surface, and the edge of the outer peripheral groove 411 'in the + Z direction forms an upper edge. I have. Further, the radius (or curvature) of the outer peripheral groove 411 ′ is configured to be larger than the radius of the spherical rotating body 42.

Further, the plurality of spherical rotators 42 are provided with an inner peripheral groove 431 'of the outer ring 43' and an outer peripheral groove 41 of the inner ring 41 '.
It is rotatably inserted between 1 '. As a result, the inner ring 41 'can be smoothly rotated with respect to the outer ring 43'.

In addition, the spherical rotator 42 has the inner peripheral groove 431 '.
Alternatively, when the outer peripheral groove 411 ′ is positioned in contact with one substantially central portion of the outer peripheral groove 411 ′,
A gap is formed between the groove 11 'and the inner circumferential groove 431'.

Further, a roller 12 is disposed at the terminal end 11A '' of the arm extending perpendicularly to the direction of the rotation axis Ax20 of the rotating body 11 "with its rotating axis directed in the radial direction of the rotating body 11". Have been. The roller 12 may be a rotatable sphere or a thinner disk. The position of the roller 12 is not limited to the end of the rotating body 11 '',
Any position on the way from the rotation axis Ax20 to the terminal may be used.

On the other hand, a rail 13 as a guide strip is fixedly mounted on the frame 10 so as to be able to contact the roller 12.
The three orbits form an arc or circle. In order to further press the roller 12 against the rail 13, a coil spring 14 is attached between the end of the rotating body 11 ″ and the frame 10 as a pressurizing section having elasticity. An elastic material such as rubber or an elastomer can be applied to the pressurizing portion in addition to the coil spring 14. Further, the magnet and another magnet or paramagnetic body opposed to the magnet are connected to the rotating body 11 and the frame 10.
It is also possible to adopt a configuration in which the pressure is applied by magnetic force by being attached to either of the sides.

The structure in which one end is connected to the frame 10 such as a coil spring 14 as a pressurizing portion is similar to that of the rotating body 1 shown in FIG.
The rotation range of 1 ″ is relatively narrow and limited, and is suitable for forward rotation and reverse rotation within this range, that is, for turning. On the other hand, in the configuration of the pressurizing section by the magnetic force, the structure is uncoupled, so that the rotation range is not limited, and therefore, it is suitable for operation at any rotation angle or rotation angle including 360-degree rotation.

The rotating shaft support mechanism A5 configured as described above
Will be described below. The rotation shaft unit 20 is driven by rotation driving means (not shown) such as a motor or an electromagnetic actuator.
When the rotating body 11 ″ rotates or rotates, the roller 12 at the end 11A ″ of the rotating body 11 ″
4 while being pressed against the rail 13 by the
The end 11A '' of 1 '' moves along the rail 13. In this manner, the end 11A '' of the rotating body is supported by the rail 13 fixed to the frame 10, so that the bending of the rotating body 11 '' due to its own weight or the like is reduced.

At this time, if the surface height of the rail 13 is not flat, but is wavy, for example, the roller 12 at the end 11A ″ of the rotator traces, so that the end 11
A ″ is displaced up and down. This vertical displacement is caused by rotating body 1
By tilting 1 ″, a tilting force is applied to the rotating shaft portion 20.

On the other hand, when the elastic body 8 is pressed,
3 is pushed in the + Z direction, the sliding member 23
0 slidably comes into contact with the outer end surface 10a of the inner ring 4 when the rotating shaft 20 moves in the −Z direction due to the reaction that occurs here, the inner ring 4 of the bearing 4 ′ fitted to the rotating shaft 20.
1 ′ moves in the −Z direction.

By the movement of the inner ring 41 ', the arc-shaped outer peripheral groove 411' provided in the inner ring 41 'also becomes -Z.
As a result, the surface of the outer circumferential groove 411 ′ protrudes outward in the radial direction with the movement, and firstly, the gap between the ball-shaped rotating body 42 is filled. Then, when the movement further proceeds, the upper edge, which is the groove end in the + Z direction, comes into contact with the ball-shaped rotator 42, and the upper edge becomes the ball-shaped rotator 4.
Press 2 in the -Z direction.

The ball-shaped rotator 42 pressed in the −Z direction moves in the −Z direction along the inner circumferential groove 431 ′ of the outer ring 43 ′ of the bearing 4 ′, and relatively protrudes inward. The gap between the inner surface of the inner circumferential groove 431 ′ is filled. As the movement further proceeds, the lower edge, which is the −Z direction groove end of the inner circumferential groove 431 ′ of the outer ring 43 ′, comes into contact with the ball-shaped rotator 42 and reaches an equilibrium state.

The above operation will be described in more detail. When the gap around the ball-shaped rotator 42 is sufficiently large, the ball-shaped rotator 42 is held in contact with both the lower edge and the upper edge as described above. When the gap around the ball-shaped rotator 42 is smaller than this, the ball-shaped rotator 42 is moved to an appropriate position on the surface of the inner circumferential groove 431 'up to the lower edge and to the upper edge. Of the outer peripheral groove 411 ′.

In any case, as described above, there is no gap between the two grooves 411 ', 431' of the bearing 4 'and the ball-shaped rotator 42, and in this state, the ball-shaped rotator 42 becomes smooth. The inner ring part 4
1 'can be smoothly rotated with respect to the fixed outer ring 43'. Therefore, the inner ring 4 of the bearing 4 '
The rotation shaft portion 20 fitted to only 1 'can be smoothly rotated.

Here, as described above, when the end of the rotating body 11 ″ is displaced up and down and a tilting force is applied to the rotating shaft portion 20, the rotating shaft portion 20 becomes the inner ring portion of the bearing 4 ′. Because it is supported only by 41 '
Both grooves of the inner ring portion 41 'and the outer ring portion 43' and the ball-shaped rotating body 4
The rotation shaft portion 20 can be freely tilted within a range allowed by a gap (play portion) formed by the rotation shaft 2. At the time of this inclination, as described in detail above, the ball-shaped rotator 42 engages with the inner circumferential groove 4 under a state where a pressure is applied by the coil spring 8 which is an elastic body.
The position in contact with the surface of the outer peripheral groove 411 'and 31' is updated,
The ball-shaped rotating body 42 is in contact with both at an appropriate position and is rotatably held without play.

Further, at this time, in the configuration in which the center penetrating portion of the sliding member 23 is not in contact with the rotating shaft portion 20, there is a gap between the central penetrating portion and the rotating shaft portion 20, so that the inclination of the rotating shaft portion 20 is reduced. 23 is not hindered.

In the configuration in which the central through portion of the sliding member 23 contacts the rotating shaft portion 20, the sliding member 23 slides in the radial direction with the inclination of the rotating shaft portion 20, so that the rotating shaft portion 20 is also inclined. It does not become an obstacle at the time.

Further, in both the contact and non-contact configurations, the elastic body 8 slightly deforms due to the end of the rotary shaft 20 including the flange 9 swinging due to the inclination of the rotary shaft 20. Due to the above characteristics, the application of the preload is continued even under a slight deformation.

As described above, the bearing 4 'functions as a mechanism for absorbing the inclination generated in the rotating shaft portion 20 due to the vertical displacement of the end of the rotating body 11, and for smoothly rotating the rotating shaft portion 20. Moreover, since only one bearing is used, it is possible to obtain a compact configuration with a low bulk in the axial direction.

Further, even if the rail 13 is not flat and there is an error, the rotary shaft 20 is inclined to follow the error and smooth rotation is maintained. Further, for a predetermined purpose, the rail 13
In the case of a configuration where a step or wavy portion is intentionally provided on the
According to the configuration of the present embodiment, it is possible to accurately follow steps and undulations, and it is possible to maintain smooth rotation while tilting the rotating shaft portion 20 correspondingly.

[0204] To summarize the above operation, the inner ring portion 41 'of the bearing 4' moves in the -Z direction due to the preload of the elastic body 8 which is to be restored by extension, and the ball-shaped rotating body 4
2 is rotatably held between the inner ring 41 'and the outer ring 43' without any gap. At this time, since the rotating shaft portion 20 is fitted only to the inner ring portion 41 ′ of the bearing 4 ′, the rotating shaft portion 20 can be tilted. Because it ’s free,
The inclination of the rotating shaft portion 20 is not hindered by the sliding member 23. Further, according to the inclination of the rotating shaft portion 20, the ball-shaped rotating body 4 is formed.
The position of the groove with which the groove 2 contacts moves to the equilibrium point, but is always rotatably held in the bearing 4 ′ without any gap by the constant preload of the elastic body 8.

As described above, since the radius or curvature of each groove provided in the bearing 4 'is configured to be larger than the radius of the spherical rotating body 42, the rotating shaft 11 is vertically moved at the end of the rotating body 11. Even if the inclination of 20 causes a slight inclination between the inner ring portion 41 'and the outer ring portion 43', it is possible to rotate accurately. As described above, the rotating shaft portion 20 rotatably supported by the bearing 4 ′ can be inclined while rotating by using the inclination angle of the bearing 4 ′, and the elastic body 8 can not be forced during the inclination due to its characteristics. Pressure without pressure can be applied.

Next, a fifth embodiment of the rotating shaft supporting method according to the present invention includes a ball-shaped rotating body 42 and an outer circumferential groove 411 'having a curvature larger than the radius of the ball-shaped rotating body 42 in FIG. An outer ring portion 43 'having an inner peripheral groove 431' having a curvature larger than the radius of the inner ring portion 41 'and the ball-shaped rotating body 42 is provided, and the ball-shaped rotating body 42 is rotatably held between both grooves. Using the bearing 4 ', the outer ring 43' of the bearing 4 'is fixed to the frame 10, and the rotation shaft 20 is provided on the inner periphery of the inner ring 41'.
And a sliding member 23 having a central through portion 23a is slidably disposed on the outer end surface 10a of the outer end surface 10a of the frame 10 so as to be slidably in contact with the outer end surface 10a. The sliding member 23 is pressed against the outer end surface 10 a of the frame 10 by inserting and extending the coil spring 8 as a pressurizing means between the end of the rotating shaft portion 20 and the sliding member 23. And a rotatable roller 12 disposed at an arbitrary position in the terminal direction of the rotating body 11 '' is fixed to the frame 10 by a coil spring 14 as a pressurizing section having elasticity, and is a rail as a guide strip. 13 is pressed.

The operation according to the fifth embodiment of the rotating shaft supporting method is the same as the operation of the fifth embodiment of the rotating shaft supporting mechanism according to the present invention, and therefore the description is omitted.

FIG. 9 shows a sixth embodiment of the rotary shaft supporting mechanism according to the present invention.
It is a sectional view of an embodiment. As shown in the figure, a rotating shaft support mechanism A6 according to the present invention is fitted to a bearing 4 'fixed to a side peripheral surface of a through hole provided in a frame 10 and an inner periphery of the bearing 4'. And a connecting portion 3 ′ fixedly or integrally formed on the upper end of the rotating shaft portion 20.
And a rotating body 25 fixedly or integrally formed at the upper end of the connecting portion 3 'and extending in a direction orthogonal to the rotating shaft.

[0209] The rotating shaft portion 20 is rotatable about the rotating shaft Ax20.
When the Z direction and the downward direction of the rotation axis Ax20 are conveniently defined as the −Z direction, the sliding member 23 having a central through portion is slidably in contact with the outer end surface 10a of the frame 10 in the −Z direction, The rotating shaft portion 20 is extended by being inserted into the central through portion in a contact or non-contact manner, and a flange 9 protruding in a radial direction is fixed to an end of the rotating shaft portion 20. A coil spring 8 as an elastic body is interposed between the flange 9 and the sliding member 23 as an elastic member.

Further, a sliding auxiliary member is attached or pasted to at least one of the surface of the sliding member 23 on the side in contact with the outer end surface 10a of the frame 10 or the outer end surface 10a of the frame 10 on the side of the sliding member 23. It can also be configured by setting. As the sliding aid, for example, a graphite-based lubricant or a lubricant such as tetra-fluoro-ethylene can be used.

Here, the coil spring 8 is always in a compressed state in a state where it is interposed between the flange 9 and the sliding member 23. Therefore, the elastic force which is to be restored by elongation always increases between the flange 9 and the sliding member 23. It is configured to provide.

[0212] The bearing 4 'comprises an outer ring 43', an inner ring 41 ', and a plurality of spherical rotating bodies 42. Outer ring 4
An inner circumferential groove 431 'having an arc-shaped cross section is formed in the inner circumference of 3' so as to make a round around the inner circumferential surface, and an edge of the inner circumferential groove 431 'in the -Z direction forms a lower edge. Further, the radius (or curvature) of the inner peripheral groove 431 ′ is configured to be larger than the radius of the spherical rotating body 42.

On the other hand, on the outer periphery of the inner ring portion 41 ', an outer peripheral groove 411' having an arc-shaped cross section is formed so as to go around the outer peripheral surface, and the edge of the outer peripheral groove 411 'in the + Z direction forms an upper edge. I have. Further, the radius (or curvature) of the outer peripheral groove 411 ′ is configured to be larger than the radius of the spherical rotating body 42.

Further, the plurality of spherical rotators 42 are provided with an inner peripheral groove 431 'of the outer ring 43' and an outer peripheral groove 41 of the inner ring 41 '.
It is rotatably inserted between 1 '. As a result, the inner ring 41 'can be smoothly rotated with respect to the outer ring 43'.

In addition, the spherical rotator 42 has an inner circumferential groove 431 '.
Alternatively, when the outer peripheral groove 411 ′ is positioned in contact with one substantially central portion of the outer peripheral groove 411 ′,
A gap is formed between the groove 11 'and the inner circumferential groove 431'.

Further, a ball 26 is rotatably fitted to the distal end 25A of the arm extending perpendicularly to the direction of the rotation axis Ax20 of the rotating body 25. The distal end 25A of the arm portion has a forked shape, and a concave spherical concave portion is formed on both inner sides. The spherical surface 26 is slidably sandwiched between the two concave spherical surfaces.

On the other hand, a guide frame 27 having a groove 27a for allowing the ball 26 to be rotatably or slidably fitted and movable in the frame 10 is fixedly mounted with the ball 26 fitted in the groove 27a. I have. The trajectory of the groove 27a is
It forms an arc or circle and is capable of operation at any angle of rotation or rotation, including 360 degrees of rotation.

Next, the operation of the rotating shaft support mechanism A6 will be described. When the rotating shaft portion 20 and the rotating body 25 are rotated or rotated by rotation driving means (not shown) such as a motor or an electromagnetic actuator, the ball 26 fitted into the end 25a of the rotating body 25 rotates or slides, and the guide frame 27 is rotated. The rotating body 25 is also rotated or slid in the groove 27a of the rotator 25 to smoothly move the rotating body 25. As described above, the end 25a of the rotating body 25 is supported by the guide frame 27 fixed to the frame 10, and as a result, the bending of the rotating body 25 due to its own weight or the like is reduced.

Further, the guide frame 27 has a U-shape and has a sphere 2 inside.
6, the ball 26 and the end 25a of the rotating body 25 do not deviate in the vertical direction. Therefore,
When the device is dropped on the floor, a strong impact force is applied to the rotating body 25.
In addition, the vibration and deformation of the rotating body 25 that occur can be suppressed, and damage to the device can be prevented.

On the other hand, if the height of the groove 27a of the guide frame 27 is not flat and is wavy, for example,
The trace 25a displaces the distal end 25a up and down. This vertical displacement causes the rotating body 25 to incline to apply an inclining force to the rotating shaft 20.

On the other hand, when the elastic body 8 presses the sliding member 23 in the + Z direction by the pressurization, the sliding member 23 slidably comes into contact with the outer end surface 10a of the frame 10, and the reaction generated there causes the rotating shaft portion 20 to move in the negative direction. Moving in the Z direction,
The inner ring portion 41 'of the bearing 4' fitted to the rotating shaft portion 20 moves in the -Z direction.

By the movement of the inner ring portion 41 ', the arc-shaped outer peripheral groove 411' provided in the inner ring portion 41 'also becomes -Z.
As a result, the surface of the outer circumferential groove 411 ′ protrudes outward in the radial direction with the movement, and firstly, the gap between the ball-shaped rotating body 42 is filled. Then, when the movement further proceeds, the upper edge, which is the groove end in the + Z direction, comes into contact with the ball-shaped rotator 42, and the upper edge becomes the ball-shaped rotator 4.
Press 2 in the -Z direction.

The ball-shaped rotator 42 pressed in the −Z direction moves in the −Z direction along the inner circumferential groove 431 ′ of the outer ring 43 ′ of the bearing 4 ′, and relatively protrudes inward. The gap between the inner surface of the inner circumferential groove 431 ′ is filled. As the movement further proceeds, the lower edge, which is the −Z direction groove end of the inner circumferential groove 431 ′ of the outer ring 43 ′, comes into contact with the ball-shaped rotator 42 and reaches an equilibrium state.

The above operation will be described in further detail. When the gap around the ball-shaped rotator 42 is sufficiently large, the ball-shaped rotator 42 is held in contact with both the lower edge and the upper edge as described above. When the gap around the ball-shaped rotator 42 is smaller than this, the ball-shaped rotator 42 is moved to an appropriate position on the surface of the inner circumferential groove 431 'up to the lower edge and to the upper edge. Of the outer peripheral groove 411 ′.

In any case, as described above, there is no gap between the grooves 411 'and 431' of the bearing 4 'and the ball-shaped rotator 42, and in this state, the ball-shaped rotator 42 is smoothly The inner ring part 4
1 'can be smoothly rotated with respect to the fixed outer ring 43'. Therefore, the inner ring 4 of the bearing 4 '
The rotation shaft portion 20 fitted to only 1 'can be smoothly rotated.

Here, as described above, when the distal end of the rotating body 25 is displaced up and down, and the tilting force is applied to the rotating shaft portion 20, the rotating shaft portion 20 becomes the inner ring portion 41 'of the bearing 4'. Of the inner ring 41 ′ and the outer ring 43 ′, and the inclination of the rotating shaft 20 can be freely adjusted within an allowable range of a gap (play portion) formed by the ball-shaped rotator 42. Is made. The rotation axis A
When x20 is inclined to the rotation axis Ax21, as described in detail above, the ball-shaped rotator 42 receives the inner circumferential groove 431 'and the outer circumferential groove 411' under a state where a pressure is applied by the coil spring 8 which is an elastic body. The position in contact with the surface is updated, and in a state where the ball-shaped rotating body 42 is in contact with both at an appropriate position and there is no backlash,
Moreover, it is held rotatably.

Further, at this time, in the configuration in which the center penetrating portion of the sliding member 23 is not in contact with the rotating shaft portion 20, there is a gap between the central penetrating portion and the rotating shaft portion 20, so that the inclination of the rotating shaft portion 20 is reduced. 23 is not hindered.

In the configuration in which the central through portion of the sliding member 23 contacts the rotating shaft portion 20, the sliding member 23 slides in the radial direction with the inclination of the rotating shaft portion 20, so that the rotating shaft portion 20 is also inclined. It does not become an obstacle at the time.

Further, in both the contact and non-contact configurations, the elastic body 8 slightly deforms due to the end of the rotary shaft 20 including the flange 9 swaying due to the inclination of the rotary shaft 20. Due to the above characteristics, the application of the preload is continued even under a slight deformation.

As described above, the bearing 4 'functions as a mechanism for absorbing the inclination generated in the rotating shaft portion 20 due to the vertical displacement of the distal end 25A of the rotating body 25 and for smoothly rotating the rotating shaft portion 20. Even if 27 is not flat and there is an error, the rotating shaft 20 tilts following this,
And smooth rotation is maintained.

Also, in the case where the guide frame 17 is intentionally provided with a step or a groove having a undulating locus along with the rotation angle as shown in FIG. For example, it is possible to accurately follow a step or undulation, and it is possible to maintain smooth rotation while tilting the rotating shaft portion 20 correspondingly.

In addition, since only one bearing is used, a compact structure having a low bulk in the axial direction can be obtained.

To summarize the above operation, the inner ring portion 41 'of the bearing 4' moves in the -Z direction due to the preload of the elastic body 8 which is to be restored by the extension, and the ball-shaped rotating body 4 '
2 is rotatably held between the inner ring 41 'and the outer ring 43' without any gap. At this time, since the rotating shaft portion 20 is fitted only to the inner ring portion 41 ′ of the bearing 4 ′, the rotating shaft portion 20 can be tilted. Because it ’s free,
The inclination of the rotating shaft portion 20 is not hindered by the sliding member 23. Further, according to the inclination of the rotating shaft portion 20, the ball-shaped rotating body 4 is formed.
The position of the groove with which the groove 2 contacts moves to the equilibrium point, but is always rotatably held in the bearing 4 ′ without any gap by the constant preload of the elastic body 8.

As described above, since the radius or curvature of each groove provided in the bearing 4 ′ is configured to be larger than the radius of the spherical rotating body 42, the end 25 of the rotating body 25 is formed.
The rotation shaft portion 20 is inclined by the vertical movement of A, and the inner ring portion 41 ′
Even if there is a slight inclination between the outer ring 43 'and the outer ring 43', it is possible to rotate with high accuracy. As described above, the rotating shaft portion 20 rotatably supported by the bearing 4 ′ can be inclined while rotating by using the inclination angle of the bearing 4 ′, and the elastic body 8 can not be forced during the inclination due to its characteristics. Pressure without pressure can be applied.

Next, the sixth embodiment of the rotating shaft supporting method according to the present invention is provided with a ball-shaped rotating body 42 and an outer circumferential groove 411 'having a curvature larger than the radius of the ball-shaped rotating body 42 in FIG. An outer ring portion 43 'having an inner peripheral groove 431' having a curvature larger than the radius of the inner ring portion 41 'and the ball-shaped rotating body 42 is provided, and the ball-shaped rotating body 42 is rotatably held between both grooves. Using the bearing 4 ', the outer ring 43' of the bearing 4 'is fixed to the frame 10, and the rotation shaft 20 is provided on the inner periphery of the inner ring 41'.
And a sliding member 23 having a central through portion is slidably disposed on the outer end surface 10a of the frame 10 so as to be slidably in contact with the outer end surface 10a. And a coil spring 8 as a pressurizing means is interposed between the end of the rotating shaft portion 20 and the sliding member 23, and the sliding member 23 is pressed by the pressurizing to the outer end surface 1 of the frame 10.
The rotatable sphere 26, which is pressed to 0 a and fitted into an arbitrary position in the end direction of the rotating body 25, is guided narrowly in the groove 27 a of the guide frame 27.

The operation of the rotary shaft supporting method according to the sixth embodiment is the same as the above-described operation of the rotary shaft supporting mechanism according to the sixth embodiment of the present invention.

As described above, according to the present invention, a long rotating shaft portion which is susceptible to an external force component in a direction perpendicular to the shaft, or a rotating shaft (long) perpendicular to the rotating shaft (long) compared to the length of the rotating shaft portion. A rotating shaft with a rotating body with a sufficiently long rotating radius at the end is supported via one bearing, and play in the bearing is controlled by applying pressure to the rotating shaft in the longitudinal direction. And the inclination caused by errors in parts and assembly,
It absorbs at the allowable tilt angle of the shaft support mechanism. With this configuration, even with a configuration of a long rotating shaft portion or a rotating shaft portion whose length in the rotating shaft direction is relatively short with respect to the rotating radius, it is sufficient to avoid generation of a moment force that hinders operation. High rotational accuracy can be maintained.

Further, by providing a mechanism for guiding support at the end of the rotating body orthogonal to the longitudinal direction of the rotating shaft separately from the supporting mechanism of the rotating shaft, the generation at the end located at a long distance is possible. That can be suppressed, realizing a stable and smooth rotation operation.

Not only that, the guide strip or the guide frame for guiding the end of the rotating body is not flat, and the end of the rotary body moves up and down as it rotates along the guide strip or the guide frame. Even if the guide strip or the guide frame is provided with a step or waving for the purpose, the end of the rotating body can follow without hindrance. Since the mechanism absorbs the rotation, stable and smooth rotation can be achieved, and no undesired moment force is generated in the shaft support mechanism.

In addition, even if a device (for example, a video camera) in which the rotating shaft support mechanism is incorporated is dropped on the floor or the like, and a strong impact force acts on the rotating shaft supporting mechanism or the entire device, the guide frame is rotated. , Vibration and deformation generated at the end of the rotating body due to the impact force are suppressed, and thus, a structure that is robust against the impact force can be realized.

[0241]

As described in detail above, claim 1 of the present invention
The rotating shaft support mechanism according to the first aspect of the invention has a structure in which the rotating shaft portion is fitted to the inner periphery of the inner ring portion of the first bearing, the outer ring portion is fixed to the frame, and the outer ring Part is fixed, and the rotating shaft part is inserted through the inner circumference of the inner ring part of the second bearing in a non-contact manner, and the radius of the cross section of both grooves formed in the inner ring part and the outer ring part of the bearing is measured. Larger than the radius of the rotating body,
Since the elastic member is always interposed between the end of the rotating shaft and the end face of the inner ring of the second bearing in a compressed state, the gap between the two bearings (play) ), The first bearing can absorb the tilt generated in the rotating shaft portion and can smoothly rotate the rotating shaft portion, and the second bearing can transmit the force while maintaining the rotating function. Moreover, since the second bearing is not in contact with the rotary shaft, the tilt of the rotary shaft is not hindered by the second bearing, so that a rotary shaft support mechanism capable of tilting the rotary shaft can be realized. .

[0242] The rotating shaft supporting method according to claim 2 of the present invention is characterized in that:
The outer ring portion of the first bearing is fixed to the frame, the rotating shaft portion is fitted to the inner periphery of the inner ring portion, and the outer ring portion of the second bearing is fixed at a position separated from the frame. The radius of the cross section of the groove formed in the inner ring portion and the outer ring portion is larger than the radius of the ball-shaped rotating body, and the end of the rotating shaft portion does not contact the inner circumference of the inner ring portion of the second bearing. And presses the inner ring portion of the second bearing in the first bearing direction by pressurizing by interposing a pressurizing means between the end portion and the inner ring end surface. Eliminates gaps (play) in the bearing,
Further, the inclination generated in the rotating shaft portion can be absorbed by the first bearing, the rotating shaft portion can be smoothly rotated, and the force can be transmitted by the second bearing while maintaining the rotating function. Moreover, since the second bearing is not in contact with the rotating shaft, the inclination of the rotating shaft is not hindered by the second bearing, and thus the rotating shaft can be inclined to rotate smoothly.

[0243] The rotating shaft supporting mechanism according to claim 3 of the present invention comprises:
A rotating shaft portion to which a rotating body extending orthogonally to the axial direction is connected is fitted on the inner periphery of the inner ring portion of the first bearing, and the outer ring portion is fixed to the frame, and the outer ring portion is fixed on the frame. The outer ring portion of the second bearing is fixed to the second bearing, and the rotating shaft portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner, and both the inner ring portion and the outer ring portion of the bearing are depressed. The radius of the cross section of the groove is larger than the radius of the ball-shaped rotating body, and an elastic member is interposed between the end of the rotating shaft and the inner ring end face of the second bearing in a constantly compressed state. A rotatable disk or sphere is disposed at the end position of the disk, a guide strip that can abut against the disk or sphere is fixed to the frame, and a pressurizing section having elastic force is connected to the end of the rotating body. Since the structure is interposed between the frames, the gap (play) in both bearings is eliminated by the pressurization by the elastic member, and the first base Ring can be smoothly rotating the rotary shaft portion as well as absorbing the inclination component occurring in the rotation shaft portion, and the second bearing is able to transmit forces while maintaining the rotation function. In addition, since the second bearing is not in contact with the rotating shaft, the inclination of the rotating shaft is not hindered by the second bearing.

Moreover, since the end of the rotating body is supported by the guiding strip and the pressurizing portion, the bending of the rotating body due to its own weight can be reduced, and even when the guiding strip is not flat and the end of the rotating body is displaced vertically. The rotation shaft can be followed by the inclination of the rotation shaft, whereby the rotation shaft can be inclined and a rotation shaft support mechanism that can follow the displacement of the end of the rotating body can be realized.

The rotating shaft supporting method according to claim 4 of the present invention is
An outer ring portion of the first bearing is fixed to the frame, and a rotating shaft portion to which a rotating body extending orthogonally to the longitudinal direction is connected is fitted on the inner periphery of the inner ring portion, and is separated from the frame. The outer ring portion of the second bearing is fixed at the position, the radius of the cross section of the groove formed in the inner ring portion and the outer ring portion of each bearing is made larger than the radius of the ball-shaped rotator, The distal end portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner, and a pressurizing means is interposed between the distal end portion and the end surface of the inner ring portion. Is pressed in the direction of the first bearing, and a disc or ball is rotatably arranged at the end position of the rotating body, and a guide strip capable of contacting the disc or ball is fixed to the frame to reduce the elastic force. Since the pressurizing unit provided is interposed between the end of the rotating shaft and the frame, both bearings are pressurized by the pressurizing means. The first bearing can absorb the inclination generated in the rotating shaft portion and smoothly rotate the rotating shaft portion, and the second bearing transmits the force while maintaining the rotating function. be able to. In addition, since the second bearing is not in contact with the rotating shaft, the inclination of the rotating shaft is not hindered by the second bearing.

Further, since the end of the rotating body is supported by the guiding strip and the pressurizing portion, the bending of the rotating body due to its own weight can be reduced, and even when the guiding strip is not flat and the end of the rotating body is displaced up and down. It is possible to follow by the inclination of the rotating shaft, enabling the inclination of the rotating shaft by the above,
In addition, it is possible to flexibly follow the displacement of the end of the rotating body.

[0247] The rotary shaft supporting mechanism according to claim 5 of the present invention comprises:
A rotating shaft portion to which a rotating body extending orthogonally to the axial direction is connected is fitted on the inner periphery of the inner ring portion of the first bearing, and the outer ring portion is fixed to the frame, and the outer ring portion is fixed on the frame. The outer ring portion of the second bearing is fixed to the second bearing, and the rotating shaft portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner, and both the inner ring portion and the outer ring portion of the bearing are depressed. The radius of the cross section of the groove is larger than the radius of the ball-shaped rotating body, and an elastic member is interposed between the end of the rotating shaft and the inner ring end face of the second bearing in a constantly compressed state. Arrange the ball freely at the end position of
Since the guide frame having the groove for inserting the ball is fixed to the frame, the gap (play) between the two bearings is eliminated by the pressurization by the elastic member, and the first bearing is attached to the rotating shaft. The rotating part can be smoothly rotated while absorbing the generated inclination, and the second bearing can transmit the force while maintaining the rotating function. In addition, since the second bearing is not in contact with the rotating shaft, the inclination of the rotating shaft is not hindered by the second bearing.

Furthermore, since the end of the rotating body is supported by the ball rotatably disposed at the end of the rotating body and the guide frame for narrowly inserting the ball into the groove, the bending of the rotating body due to its own weight is reduced. In addition, even when the groove of the guide frame is not flat and the end of the rotating body is displaced up and down, it can follow the inclination of the rotating shaft.

Furthermore, even when a strong impact force is applied to the rotating body, vibration and deformation of the rotating body can be suppressed by the structure in which the guide frame supports the end of the rotating body. It is possible to realize a rotating shaft support mechanism that can tilt the portion and can follow the displacement of the end of the rotating body.

According to a sixth aspect of the present invention, there is provided a method of supporting a rotating shaft.
An outer ring portion of the first bearing is fixed to the frame, and a rotating shaft portion to which a rotating body extending orthogonally to the longitudinal direction is connected is fitted on the inner periphery of the inner ring portion, and is separated from the frame. The outer ring portion of the second bearing is fixed at the position, the radius of the cross section of the groove formed in the inner ring portion and the outer ring portion of each bearing is made larger than the radius of the ball-shaped rotator, The distal end portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner, and a pressurizing means is interposed between the distal end portion and the end surface of the inner ring portion. Is pressed in the direction of the first bearing, and furthermore, a sphere is rotatably arranged at the end position of the rotating body, and a guide frame fixed to the frame with a groove portion for narrowly inserting the sphere is provided.
Since the ball and the rotating body are guided, the gap (play) in both bearings is eliminated by the pressurization by the elastic member, and the first bearing absorbs the inclination generated in the rotating shaft and smoothly rotates the rotating shaft. And the second bearing can transmit the force while maintaining the rotation function. In addition, since the second bearing is not in contact with the rotating shaft, the inclination of the rotating shaft is not hindered by the second bearing.

Further, since the end of the rotating body is supported by the ball rotatably disposed at the end of the rotating body and the guide frame for narrowly inserting the ball into the groove, the bending of the rotating body due to its own weight is reduced. In addition, even when the groove of the guide frame is not flat and the end of the rotating body is displaced up and down, it can follow the inclination of the rotating shaft.

Further, even when a strong impact force is applied to the rotating body, vibration and deformation of the rotating body can be suppressed by the structure in which the guide frame supports the end of the rotating body. The configuration can be such that the portion can be tilted and can follow the positional displacement of the end of the rotating body.

According to the seventh aspect of the present invention,
The rotating shaft is fitted to the inner periphery of the inner ring of the bearing, the outer ring is fixed to the frame, and the radius of the cross-section of both grooves recessed in the inner and outer rings of the bearing is spherical. A sliding member having a central through portion is slidably disposed on the outer end face of the frame, which is larger than the radius of the rotating body, and is located in the longitudinal direction of the rotating shaft portion of the frame. The sliding member is inserted through the central through portion of the sliding member in a contact or non-contact manner, and an elastic member is always interposed in a compressed state between the end portion of the rotating shaft and the sliding member. The pressurization of the elastic member can be transmitted to the bearing while moving, and this pressurization eliminates the gap (play) in the bearing, and the bearing absorbs the inclination generated in the rotating shaft and rotates the rotating shaft smoothly. Can be.

In addition, in the configuration in which the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member contacts the rotating shaft portion. In the configuration, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft, so that there is no obstacle to the inclination of the rotating shaft.

Further, since only one bearing is used, a mechanism having a low bulk in the axial direction can be provided, and a small-sized rotating shaft supporting mechanism capable of tilting the rotating shaft portion as described above can be realized. it can.

The rotating shaft supporting method according to claim 8 of the present invention is characterized in that
The rotating shaft is fitted to the inner periphery of the inner ring of the bearing, the outer ring is fixed to the frame, and the radius of the cross-section of both grooves recessed in the inner and outer rings of the bearing is spherical. A sliding member having a central through portion is slidably disposed on the outer end face of the frame, which is larger than the radius of the rotating body, and is located in the longitudinal direction of the rotating shaft portion of the frame. The sliding member is inserted into the central through portion of the sliding member in a contact or non-contact manner, and the sliding member is pressed against the outer end surface of the frame by a pressurizing means interposed between the end portion of the rotating shaft and the sliding member. The pressure of the pressurizing means can be transmitted to the bearing through the sliding member that slides, and the pressurized space (play) in the bearing can be transmitted.
, And the bearing can absorb the inclination generated in the rotating shaft and smoothly rotate the rotating shaft.

In addition, when the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member contacts the rotating shaft portion. Even in this case, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft, so that there is no obstacle to the inclination of the rotating shaft.

As described above, the rotating shaft can be smoothly rotated by being inclined. Moreover, since only one bearing is used, the bulk in the axial direction can be reduced.

According to a ninth aspect of the present invention, there is provided a rotating shaft support mechanism comprising:
A rotating shaft portion to which a rotating body extending perpendicular to the longitudinal direction is connected is fitted on the inner periphery of the inner ring portion of the bearing, the outer ring portion is fixed to the frame, and the inner ring portion and the outer ring portion of the bearing are fixed. The radius of the cross section of both grooves indented in the ring is made larger than the radius of the ball-shaped rotating body, and the outer end face located in the longitudinal direction of the rotating shaft portion of the frame,
A sliding member having a central through portion is slidably disposed on the outer end surface of the sliding member, and the rotary shaft portion is inserted into the central through portion of the sliding member in a contact or non-contact manner. An elastic member is always interposed in a compressed state between them, and a disk or ball is rotatably disposed at the end position of the rotating body, and a guide strip capable of contacting the disk or ball is fixed to the frame. Since the pressurizing section provided with elastic force is interposed between the end of the rotating body and the frame, the pressurization of the elastic member can be transmitted to the bearing while the sliding member slides. With this pressurization, a gap (play) in the bearing is eliminated, and the bearing can absorb the inclination generated in the rotating shaft portion and rotate the rotating shaft portion smoothly.

In addition, in the configuration in which the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member contacts the rotating shaft portion. In the configuration, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft, so that there is no obstacle to the inclination of the rotating shaft.

Further, since only one bearing is used, a mechanism having a low axial bulk can be provided.

Furthermore, since the end of the rotating body is supported by the guiding strip and the pressurizing portion, the bending of the rotating body due to its own weight can be reduced, and even when the guiding strip is not flat and the end of the rotating body is displaced up and down. By following the above description, it is possible to realize a small-sized rotating shaft supporting mechanism that can follow the inclination of the rotating shaft portion and can follow the positional displacement of the terminal end of the rotating body.

According to a tenth aspect of the present invention, there is provided the rotating shaft supporting method, wherein a rotating shaft portion to which a rotating body extending perpendicularly to the longitudinal direction is connected is fitted to the inner periphery of the inner ring portion of the bearing. The outer ring portion is fixed to the frame, the radius of the cross section of both grooves recessed in the inner ring portion and the outer ring portion of the bearing is made larger than the radius of the ball-shaped rotator, and A sliding member having a central through portion is slidably provided on the outer end surface located at the outer end surface, and the rotating shaft portion is inserted into the central through portion of the sliding member in a contact or non-contact manner, and is rotated. The sliding member is pressed against the outer end surface of the frame by pressurizing means interposed between the distal end portion of the shaft portion and the sliding member, and a disk or a ball is disposed rotatably at the distal end position of the rotating body, A guide strip that can contact these discs or balls is fixed to the frame, and the pressurizing section with elastic force is used. Since the rotating body is pressed against the guide strip, the pressurizing force of the pressurizing means can be transmitted to the bearing via the sliding member that slides. The inclination generated in the rotating shaft can be absorbed and the rotating shaft can be smoothly rotated.

In addition, when the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member contacts the rotating shaft portion. Even in this case, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft, so that there is no obstacle to the inclination of the rotating shaft.

As described above, the rotating shaft can be smoothly rotated by being inclined. Moreover, since only one bearing is used, the bulk in the axial direction can be reduced.

Moreover, since the end of the rotating body is supported by the guiding strip and the pressurizing portion, the occurrence of bending of the rotating body due to its own weight can be reduced, and even when the guiding strip is not flat and the end of the rotating body is displaced up and down. The rotation can be followed by the inclination of the rotation shaft, and therefore, the displacement of the end of the rotating body can be flexibly followed.

A rotating shaft supporting mechanism according to claim 11 of the present invention is characterized in that a rotating shaft portion connected to a rotating body extending perpendicularly to the longitudinal direction is fitted on the inner periphery of the inner ring portion of the bearing, The outer ring portion is fixed to the frame, the radius of the cross section of both grooves recessed in the inner ring portion and the outer ring portion of the bearing is made larger than the radius of the ball-shaped rotator, and A sliding member having a central through portion is slidably provided on the outer end surface located at the outer end surface, and the rotary shaft portion is inserted into the central through portion of the sliding member in contact or non-contact with the sliding member. An elastic member is always interposed in a compressed state between the distal end of the sliding member and the sliding member, and a sphere is rotatably arranged at the distal end of the rotating body, and a guide frame having a groove for narrowly inserting the sphere into a frame. Since the sliding member slides, the pressure of the elastic member is applied to the bearing. Reach can eliminate clearance in the bearing (play) in the pressurization, the bearing can be smoothly rotating the rotary shaft portion as well as absorbing the inclination component occurring in the rotation shaft portion.

Further, in the configuration in which the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member contacts the rotating shaft portion. In the configuration, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft, so that there is no obstacle to the inclination of the rotating shaft.

Further, since only one bearing is used, a mechanism having a low axial volume can be provided.

Furthermore, since the end of the rotating body is supported by the ball rotatably disposed at the end of the rotating body and the guide frame for narrowly inserting the ball into the groove, the bending of the rotating body due to its own weight is reduced. In addition, even when the groove of the guide frame is not flat and the end of the rotating body is displaced up and down, it can follow the inclination of the rotating shaft.

Further, even when a strong impact force is applied to the rotating body, vibration and deformation of the rotating body can be suppressed by the structure in which the guide frame supports the end of the rotating body, so that the rotating shaft has excellent impact resistance. It is possible to realize a small-sized rotating shaft support mechanism that can tilt the portion and can follow the displacement of the end of the rotating body.

According to a twelfth aspect of the present invention, in the rotating shaft supporting method, a rotating shaft connected to a rotating body extending perpendicularly to the longitudinal direction is fitted to the inner periphery of the inner ring of the bearing, The outer ring portion is fixed to the frame, the radius of the cross section of both grooves recessed in the inner ring portion and the outer ring portion of the bearing is made larger than the radius of the ball-shaped rotator, and A sliding member having a central through portion is slidably provided on the outer end surface located at the outer end surface, and the rotating shaft portion is inserted into the central through portion of the sliding member in a contact or non-contact manner, and is rotated. The sliding member is pressed against the outer end surface of the frame by pressurizing means interposed between the distal end of the shaft portion and the sliding member, and a ball is rotatably disposed at the distal end of the rotating body. The sphere and the rotating body are guided by a guiding frame fixed to the frame with a narrow groove. Because it's, possible to transmit the pressurization of pressurization application means to the bearing via a slide member that slides, without a gap in the bearing (play) in the pressurization,
The bearing can absorb the inclination generated in the rotating shaft portion and can smoothly rotate the rotating shaft portion.

In addition, when the central penetrating portion of the sliding member does not contact the rotating shaft portion, the inclination of the rotating shaft portion is not hindered by the sliding member, and the central penetrating portion of the sliding member contacts the rotating shaft portion. Even in this case, the sliding member slides in the radial direction in accordance with the inclination of the rotating shaft, so that there is no obstacle to the inclination of the rotating shaft.

As described above, the rotating shaft can be smoothly rotated by being inclined. Moreover, since only one bearing is used, the bulk in the axial direction can be reduced.

Further, since the end of the rotating body is supported by the ball rotatably disposed at the end of the rotating body and the guide frame for narrowly inserting the ball into the groove, the bending of the rotating body due to its own weight is reduced. In addition, even when the groove of the guide frame is not flat and the end of the rotating body is displaced up and down, it can follow the inclination of the rotating shaft.

Further, even when a strong impact force is applied to the rotating body, the vibration and deformation of the rotating body can be suppressed by the structure in which the guide frame supports the end of the rotating body. The configuration can be such that the rotation shaft can be inclined and can follow the positional displacement of the end of the rotating body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rotation shaft support mechanism according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a first bearing of the rotary shaft support mechanism shown in FIG.

FIG. 3 is a cross-sectional view of a rotation shaft support mechanism according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an operation of the rotation shaft support mechanism shown in FIG. 3 when an inclination occurs.

FIG. 5 is a cross-sectional view of an example of a guide roller applied to the rotating shaft support mechanism according to the present invention.

FIG. 6 is a sectional view of a rotary shaft support mechanism according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a rotary shaft support mechanism according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a rotary shaft support mechanism according to a fifth embodiment of the present invention.

FIG. 9 is a cross-sectional view of a rotation shaft support mechanism according to a sixth embodiment of the present invention.

FIG. 10 is an explanatory view of a step or a displacement of a guide strip or a guide frame.

FIG. 11 is a schematic cross-sectional view showing a configuration of an example of a conventional rotary shaft support mechanism.

FIG. 12 is a schematic cross-sectional view showing the configuration of another example of a conventional rotary shaft support mechanism.

FIG. 13 is an explanatory view of the inclination of a shaft and a rotating body in a conventional rotating shaft support mechanism.

FIG. 14 is an explanatory diagram of bending of a rotating body in a conventional rotating shaft support mechanism.

FIG. 15 is a schematic cross-sectional view showing the configuration of another example of the conventional rotary shaft support mechanism.

FIG. 16 is a schematic cross-sectional view showing the configuration of still another example of the conventional rotary shaft support mechanism.

[Explanation of symbols]

A1 ... A rotating shaft support mechanism according to the present invention, Ax ... A rotating shaft,
Ax1 ... Rotation axis inclined to the left, Ax2 ... Rotation axis inclined to the right, 2 ... Rotation axis part, 3 ... Connection part, 4 ... First
Bearing 41, inner ring portion 411, outer peripheral groove 41
1a upper edge, 411b lower edge, 42
... Spherical rotating body, 43 ... Outer ring part, 431 ... Inner peripheral groove, 4
31a ... upper edge, 431b ... lower edge, 5 ...
.. Second bearing 51 inner ring portion 511 outer peripheral groove 511a upper edge 511b lower edge 52 spherical rotating body 53 outer ring portion 531
Inner peripheral groove, 531a: upper edge, 531b: lower edge, 6: gap, 7: connecting portion, 8: elastic body, 9
…… Flange, 10 …… Frame, 11 …… Rotating body, θ
+: Inclination angle, θ−: inclination angle, + Z: direction from the second bearing side to the first bearing side, −Z: first
Direction from bearing side to second bearing side

Claims (12)

[Claims] A rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotating body, wherein grooves are respectively formed in an outer periphery of the inner ring portion and an inner periphery of the outer ring portion, A first bearing and a second bearing, wherein a rotating body is rotatably held between the two grooves, and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotating body. A rotating shaft supporting mechanism, wherein the rotating shaft portion is fitted to the inner periphery of the inner ring portion of the first bearing, and the outer ring portion is fixed to a frame, wherein the first bearing and the second bearing A radius or a curvature of a cross section of at least one of the grooves formed in the inner ring portion and the outer ring portion of at least one of the bearings is larger than a radius of the ball-shaped rotating body; The outer ring portion of the second bearing is fixed at a position distant from the fixed position of the first bearing. The rotating shaft portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner, and the end portion extends, and the end portion of the rotating shaft portion and the end surface of the inner ring portion of the second bearing are connected to each other. A rotating shaft support mechanism, wherein an elastic member is always interposed while being compressed in the longitudinal direction of the rotating shaft portion. 2. An inner ring portion, an outer ring portion, and a ball-shaped rotator, and grooves are respectively formed in an outer periphery of the inner ring portion and an inner periphery of the outer ring portion. A first bearing and a second bearing which are rotatably held between the grooves, and wherein the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator; A rotating shaft supporting method in which the outer ring portion of a bearing is fixed to a frame, and a rotating shaft portion is fitted to an inner periphery of the inner ring portion of the first bearing; at least one of the first bearing and the second bearing; The radius or curvature of at least one of the cross-sections of the two grooves recessed in the inner ring portion and the outer ring portion of one of the bearings is larger than the radius of the ball-shaped rotator, and the first bearing solid of the frame is formed. Fix the outer ring of the second bearing at a position away from the installation position, On the other hand, the distal end of the rotating shaft portion is inserted into the inner periphery of the inner ring portion of the second bearing in a non-contact manner and stretched, and pressurizing means is interposed between the distal end portion and the end surface of the inner ring portion. And pressurizing the inner ring portion of the second bearing in the direction of the first bearing by the pressurization. 3. A rotating shaft, a rotating body extending perpendicular to the axial direction of the rotating shaft, an inner ring, an outer ring, and a ball-shaped rotating body, the outer periphery of the inner ring and Grooves are respectively formed in the inner periphery of the outer ring portion, the ball-shaped rotating body is rotatably held between the two grooves, and the inner ring portion and the outer ring portion are interposed through the ball-shaped rotating body. A first bearing and a second bearing configured to be rotatable with each other, the rotation shaft portion being fitted to an inner periphery of the inner ring portion of the first bearing, and the outer ring portion being fixed to a frame. In the rotating shaft support mechanism provided, the radius or curvature of the cross section of at least one of the two grooves formed in the inner ring portion and the outer ring portion of at least one of the first bearing and the second bearing is the ball. Larger than the radius of the rotator, away from the first bearing fixed position of the frame An outer ring portion of the second bearing is fixed at a position, while a distal end of the rotating shaft portion extends through the inner periphery of the inner ring portion of the second bearing in a non-contact manner; An elastic member is interposed between the end of the portion and the end face of the inner ring portion of the second bearing while being constantly compressed in the longitudinal direction of the rotary shaft portion, and further extends in a direction perpendicular to the axial direction. A rotatable disk or sphere is disposed at an arbitrary position in the distal direction of the disk, and a guide strip that can abut the disk or sphere is fixed to the frame. A pressurizing portion having an elastic force for pressing in the direction of (b) is interposed between the end portion of the rotating body and the frame. 4. An inner ring portion, an outer ring portion, and a ball-shaped rotator, wherein grooves are respectively formed in an outer periphery of the inner ring portion and an inner periphery of the outer ring portion, and the ball-shaped rotator is connected to the both. A first bearing and a second bearing which are rotatably held between the grooves, and wherein the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator; A rotating shaft having the outer ring portion of a bearing fixed to a frame, and a rotating shaft portion having a rotating body extending orthogonally to a longitudinal direction fitted on an inner periphery of the inner ring portion of the first bearing; In the supporting method, a radius or a curvature of a cross section of at least one of the two grooves recessed in an inner ring portion and an outer ring portion of at least one of the first bearing and the second bearing may be determined by changing a radius or a curvature of the ball-shaped rotating body. Larger than the radius, away from the fixed position of the first bearing of the frame. An outer ring portion of the second bearing is fixed at a position where the end portion of the rotating shaft portion is extended by inserting the end portion of the rotating shaft portion into the inner periphery of the inner ring portion of the second bearing in a non-contact manner. And a pressurizing means between the end faces of the inner ring portion to press the inner ring portion of the second bearing in the direction of the first bearing by the pressurization, and any position in the end direction of the rotating body. A rotatable disk or sphere disposed on a guide strip fixed to the frame by a pressurizing section having elastic force. 5. A rotating body, a rotating body extending orthogonally to a longitudinal direction of the rotating shaft, an inner ring, an outer ring, and a ball-shaped rotating body. Grooves are respectively formed in the inner periphery of the outer ring portion, the ball-shaped rotating body is rotatably held between the two grooves, and the inner ring portion and the outer ring portion are interposed through the ball-shaped rotating body. A first bearing and a second bearing configured to be rotatable with each other. The rotating shaft portion is fitted to the inner periphery of the inner ring portion of the first bearing, and the outer ring portion is attached to a frame. In the fixed rotating shaft support mechanism, a radius or a curvature of a cross section of at least one of the two grooves formed in the inner ring portion and the outer ring portion of at least one of the first bearing and the second bearing is the above-mentioned. Larger than the radius of the ball-shaped rotator, and separated from the first bearing fixed position of the frame. The outer ring portion of the second bearing is fixedly mounted at the position, while the distal end portion of the rotating shaft portion extends through the inner circumference of the inner ring portion of the second bearing in a non-contact manner. An elastic member is always interposed between the end portion of the shaft portion and the end surface of the inner ring portion of the second bearing while being compressed in the major axis direction of the rotating shaft portion, and further extends in a direction perpendicular to the axial direction. A rotating shaft support mechanism, wherein a ball is rotatably disposed at an arbitrary position in the distal direction of the body, and a guide frame having a groove portion for inserting the ball narrowly is fixed to the frame. 6. An inner ring portion, an outer ring portion, and a ball-shaped rotator, wherein grooves are respectively formed in an outer periphery of the inner ring portion and an inner periphery of the outer ring portion, and the ball-shaped rotator is provided with the both. A first bearing and a second bearing which are rotatably held between the grooves, and wherein the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator; A rotating shaft having the outer ring portion of a bearing fixed to a frame, and a rotating shaft portion having a rotating body extending orthogonally to a longitudinal direction fitted on an inner periphery of the inner ring portion of the first bearing; In the supporting method, a radius or a curvature of a cross section of at least one of the two grooves recessed in an inner ring portion and an outer ring portion of at least one of the first bearing and the second bearing may be determined by changing a radius or a curvature of the ball-shaped rotating body. Larger than the radius, away from the fixed position of the first bearing of the frame. An outer ring portion of the second bearing is fixed at a position where the end portion of the rotating shaft portion is extended by inserting the end portion of the rotating shaft portion into the inner periphery of the inner ring portion of the second bearing in a non-contact manner. And a pressurizing means between the end faces of the inner ring portion to press the inner ring portion of the second bearing in the direction of the first bearing by the pressurization, and any position in the end direction of the rotating body. A rotatable sphere disposed in the frame is guided by a guide frame fixed to the frame having a groove for inserting the sphere narrowly. 7. A rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotator, wherein grooves are respectively formed on an outer periphery of the inner ring portion and an inner periphery of the outer ring portion, A rotating body that is rotatably held between the two grooves, the inner ring portion and the outer ring portion each include a bearing configured to be mutually rotatable via the ball-shaped rotating body; Wherein the rotating shaft portion is fitted to the inner periphery of the shaft, and the outer ring portion is fixed to a frame. A radius or a curvature of at least one cross section is larger than a radius of the ball-shaped rotating body, and a sliding member having a central penetrating portion is provided on an outer end face of the frame located in the rotating shaft portion long direction. Slidably disposed in contact with each other, wherein the rotating shaft portion is inserted through the central through portion of the sliding member in a contact or non-contact manner. An end portion extending, and an elastic member is always interposed between the end portion of the rotating shaft portion and the sliding member while being compressed in the longitudinal direction of the rotating shaft portion. mechanism. 8. An inner ring portion, an outer ring portion, and a ball-shaped rotator, and grooves are respectively formed in an outer periphery of the inner ring portion and an inner periphery of the outer ring portion, and the ball-shaped rotator is provided with the both. The outer ring portion of the bearing, which is rotatably held between the grooves and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator, is fixed to a frame, And a rotating shaft supporting method for fitting a rotating shaft portion to an inner periphery of the inner ring portion, wherein a radius or a curvature of a cross section of at least one of the two grooves formed in the inner ring portion and the outer ring portion of the bearing. Is larger than the radius of the ball-shaped rotator, and a sliding member having a central through portion is slidably provided on the outer end face of the frame, which is located in the direction of the rotation shaft portion in the longitudinal direction, so as to be slidably provided on the outer end face. Extending the end of the rotating shaft portion by contacting or non-contact with the central through portion of the sliding member And a pressurizing means is interposed between the end of the rotating shaft and the sliding member to press the sliding member against the outer end surface of the frame by the pressurization. Method. 9. A rotating shaft, a rotating body extending orthogonally to a longitudinal direction of the rotating shaft, an inner ring, an outer ring, and a ball-shaped rotating body. Grooves are respectively formed in the inner periphery of the outer ring portion, the ball-shaped rotating body is rotatably held between the two grooves, and the inner ring portion and the outer ring portion are interposed through the ball-shaped rotating body. A bearing configured to be rotatable with respect to each other, wherein the rotating shaft portion is fitted to the inner periphery of the inner ring portion, and the outer ring portion is fixed to a frame. A radius or a curvature of at least one of the cross-sections of the two grooves recessed in the inner ring portion and the outer ring portion is larger than a radius of the ball-shaped rotating body, and in a direction in which the rotating shaft portion of the frame is elongated. A sliding member having a central through portion is slidably provided on the outer end surface located at the outer end surface, and the rotating shaft portion is slidably mounted on the outer end surface. The end portion extends by being inserted into the central through portion of the member in a contact or non-contact manner, and an elastic member is always provided between the end portion of the rotating shaft portion and the sliding member in the longitudinal direction of the rotating shaft portion. A rotatable disk or sphere is disposed at an arbitrary position in the terminal direction of the rotating body that is compressed and interposed and extends perpendicularly to the elongate direction, and can abut on the disk or sphere. A guide strip is fixed to the frame, and a pressurizing section having an elastic force for pressing the disc or ball in the direction of the guide strip is interposed between the end of the rotating body and the frame. A rotating shaft support mechanism. 10. An inner ring portion, an outer ring portion, and a ball-shaped rotator, and grooves are formed in the outer periphery of the inner ring portion and the inner periphery of the outer ring portion, respectively. The outer ring portion of the bearing, which is rotatably held between the grooves and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator, is fixed to a frame, And a rotating shaft supporting method in which a rotating shaft portion having a rotating body extending perpendicularly to a longitudinal direction is fitted to an inner periphery of the inner ring portion. A sliding member provided with a central through portion on an outer end surface of the frame, which has a radius or a curvature of at least one of the cross sections larger than a radius of the ball-shaped rotating body, and is located at an outer end face of the frame in a longitudinal direction of the rotating shaft portion. Is disposed slidably in contact with the outer end face, and a distal end of the rotating shaft portion is disposed inside the sliding member. It is inserted into the penetrating part in a contact or non-contact manner and stretched, and a pressurizing means is interposed between the end of the rotating shaft and the sliding member, and the sliding member is moved by the pressurization to the frame. A rotatable disk or sphere that is pressed against the outer end surface and disposed at an arbitrary position in the terminal direction of the rotating body is connected to a guide strip fixed to the frame by a pressurizing unit having elastic force. A rotating shaft supporting method, characterized in that the rotating shaft is pressed. 11. A rotating shaft portion, a rotating body extending perpendicular to the axial direction of the rotating shaft portion, an inner ring portion, an outer ring portion, and a ball-shaped rotating body. Grooves are respectively formed in the inner periphery of the outer ring portion, the ball-shaped rotating body is rotatably held between the two grooves, and the inner ring portion and the outer ring portion are interposed through the ball-shaped rotating body. A rotating shaft support mechanism comprising: a bearing configured to be rotatable with each other; wherein the rotating shaft portion is fitted to an inner periphery of the inner ring portion; and the outer ring portion is fixed to a frame. A radius or a curvature of at least one of the cross-sections of the two grooves recessed in the inner ring portion and the outer ring portion is larger than a radius of the ball-shaped rotating body, and is located in the rotating shaft portion long direction of the frame. A sliding member having a central through portion is slidably provided on the outer end surface to be slidably disposed on the outer end surface, and the rotating shaft portion slides The end portion extends by being inserted into the central through portion of the member in a contact or non-contact manner, and an elastic member is always provided between the end portion of the rotating shaft portion and the sliding member in the longitudinal direction of the rotating shaft portion. A guide frame having a groove rotatably disposed at an arbitrary position in a terminal direction of a rotating body that is compressed and interposed and extends perpendicularly to the axial direction, and having a groove portion for inserting the ball narrowly, is provided on the frame. A rotating shaft support mechanism fixed to the rotary shaft. 12. An inner ring portion, an outer ring portion, and a ball-shaped rotator, grooves are formed in an outer periphery of the inner ring portion and an inner periphery of the outer ring portion, respectively. The outer ring portion of the bearing, which is rotatably held between the grooves and the inner ring portion and the outer ring portion are configured to be mutually rotatable via the ball-shaped rotator, is fixed to a frame, And a rotating shaft supporting method in which a rotating shaft portion having a rotating body extending perpendicularly to a longitudinal direction is fitted to an inner periphery of the inner ring portion. A sliding member provided with a central through portion on an outer end surface of the frame, which has a radius or a curvature of at least one of the cross sections larger than a radius of the ball-shaped rotating body, and is located at an outer end face of the frame in a longitudinal direction of the rotating shaft portion. Is disposed slidably in contact with the outer end surface, and a distal end of the rotating shaft portion is disposed inside the sliding member. It is inserted into the penetrating part in a contact or non-contact manner and stretched, and a pressurizing means is interposed between the end of the rotating shaft and the sliding member, and the sliding member is moved by the pressurization to the frame. A guide that is slidably pressed against the outer end face and that is rotatably disposed at an arbitrary position in the terminal direction of the rotating body and has a groove portion for narrowly inserting the ball, and is fixed to the frame. A rotating shaft supporting method characterized by being guided by a frame.