JPH0641126Y2 - Sphere rotation drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sphere rotation drive device that supports and rotates a sphere to measure the surface roughness of the sphere.

[Conventional technology]

Heretofore, a rotary drive device that supports and rotates a sphere for measuring the surface roughness of the sphere has not been known so far.

By the way, when measuring the surface roughness in the circumferential direction of a rotating body such as a cylinder or a cylinder, the rotating body is supported by a pair of rollers arranged in parallel, and the rotating body is rotated by rotating one roller. A rotary drive device of a rotating type is used. However, even if the device tries to support and rotate the sphere, the sphere rolls in the axial direction of the roller and measurement is impossible.

On the other hand, it has been attempted to provide a continuous groove or the like on one side of the roller to engage the sphere, and to support the sphere at a fixed position without hindering the original rotation of the sphere. .

For example, the rotary drive device 60 shown in FIG. 6 includes a pair of rollers 62 and 63 arranged in parallel with the frame 61 and a rotary drive motor 64 for rotationally driving these, and one roller 63 has a circular shape. A groove portion 65 having a substantially V-shaped cross section is formed continuously in the circumferential direction. Therefore, by placing the spherical body 66 on both rollers 62, 63 and engaging the groove portion 65 at that time, the movement of the spherical body 66 along the rollers 62, 63 is restricted, and the roller 62 at a fixed position. , 63 is driven to rotate.

[Problems to be solved by the device]

In such a rotation drive device, the sphere is supported by the two rollers at three points by the groove portion, and does not roll in the axial direction of the roller. However, in the conventional rotation driving device, only one of the pair of rollers is driven, so that when the weight of the spherical body is light, the frictional force from the other roller acts to prevent the spherical body from rotating smoothly. . In contrast,
By driving both rollers at the same speed at the same time, the sphere can be smoothly rotated.

However, as in the rotary drive device 60 of FIG.
To engage the sphere 66 with both rollers 62, 6
If you try to rotate 3 respectively, each roller 62, 63 and sphere
It becomes necessary to make the angular velocities of the three points that contact 66 and 66 constant.

That is, as shown in FIG. 7, when the spherical body 66 is engaged with the groove portion 65 of the roller 63, the rotation radius R ₁ of the contact point with respect to the rotation axis A ₂ of the roller 63 is equal to the radius R _{0 of the} roller 63, Sphere 66
Rotation radius r ₁ relative to the axis of rotation A ₁ of smaller than the radius r ₀ of the sphere 66, the angular velocity of the spherical body 66 which roller 63 provides is increased from the angular velocity to provide the inherent angular velocity namely roller 62. Further, as shown in FIG. 8, when the spherical body 66 has a relatively small diameter,
The spherical body 66 and the roller 63 make contact with each other at the conical surfaces 67 and 68 forming the groove portion 65, and the rotation radius r ₁ of the contact point on the spherical body 66 side is the roller 63.
The terms of smaller than the radius R _0, the rotation radius R ₁ of the roller 63 side
Also becomes smaller than the radius R _{0 of} the roller 63, and the difference in angular velocity given to the sphere 66 by each of the rollers 62 and 63 becomes more complicated.

Therefore, the rollers 62, 6 are not used in the rotary drive device 60 shown in FIG.
If both 3 are rotationally driven, there is a problem that the sphere 66 is not stably rotationally driven.

To solve such a problem, like the rotary drive device 90 shown in FIG. 9, both rollers 62 and 63 are provided with similar groove portions 65 to cause a change equivalent to the change in the radius of rotation of each roller 63. As a result, the angular velocities of the spheres 66 given by the rollers 62 and 63 can be always matched. However, in this device 90, it is necessary to process the groove portion 65 in each of the rollers 62 and 63, and both the groove portions 65 support the sphere 66 at two points of two points each, so that each point is It is necessary to adjust the axial position of the rollers 62, 63 relative to each other to make accurate contact.
There is a problem that the manufacturing becomes complicated and the cost becomes high.

An object of the present invention is to prevent a sphere to be rotationally driven from being moved in the axial direction of the roller by holding it in a fixed position, and to stably rotate and drive the sphere at a desired speed. To provide a rotary drive device.

[Means for Solving the Problems]

The present invention is a sphere rotation drive device in which two rollers support a sphere at three points, and the rotational drive forces on the sphere at the three points are both equal in angular velocity.

The detailed configuration has two rollers arranged axially in parallel, for mounting and supporting the sphere, and a rotation drive motor,
Rotation driving means for rotating and driving the two rollers in the same direction and at the same peripheral speed, and a constricted portion for supporting a sphere is formed on one of the two rollers, and in addition, the constricted portion is configured. The two surfaces of the roller that face each other in the axial direction are to be partial curved surfaces of a sphere, the center of which is located on the axis of the roller having the constricted portion and the diameter of which is the same as the diameter of the roller having the constricted portion. That is.

[Action]

In the present invention thus constructed, when the synchronous driving means is output, both the two rollers rotate at the same peripheral speed, and each applies a rotational driving force to the sphere. At this time, the portion of the sphere supported by the roller having no constriction receives the rotational driving force of the above-mentioned peripheral speed in a circular shape centered on the radius of the sphere.

On the other hand, the part of the sphere supported by the roller having the constricted portion has a circular shape whose radius is the distance connecting the part and the rotation axis of the sphere, and the constricted part which supports the sphere with respect to the above peripheral speed. It receives the rotational driving force at the peripheral speed corresponding to the part of the partially spherical surface.

For this reason, the roller provided with the constricted portion and the roller not provided with the convoluted portion which are rotated at the same peripheral speed in advance drive the sphere to rotate at the same angular velocity, so that the sphere can be always driven to rotate in a stable state. The present invention achieves the above object.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. However, the present invention is not limited to this embodiment.

The rotary drive device 1 for a spherical body shown in FIG. 1 includes a bottom plate 11 and a back plate 12.
And a substantially bench-shaped frame 10 formed by the shaft support plates 13 and 14 on both sides, and a pair of mount rollers 15 and 16 are arranged in parallel on the open upper part of the frame 10. Both ends of each of the mounting rollers 15 and 16 are rotatably supported by the shaft support plates 13 and 14, respectively. Further, the rotation driving device 1 includes a rotation driving motor 20 inside, and the loading rollers 15 and 16 are provided.
Is rotated to rotate the spheres 2 placed in the mutually spaced portions, and the contactor 4 of the surface roughness measuring device 3 is used to measure the circumferential surface roughness of the spheres 2. There is.

Here, the rotation drive motor 20 is formed by coaxially connecting a reduction mechanism 22 to a motor unit 21 using an electric motor, and
The desired rotational force can be generated at 23. In addition, the motor unit 21
A tachometer 24 is connected to the motor unit 21 and the tachometer 24 are connected to a control device (not shown) via a connector 25, and the number of revolutions of the output shaft 23 is accurately measured by feedback from the tachometer 24. Controlled.

As shown in FIG. 2 to FIG. 4, in the rotary driving device 1 for a spherical body, the output shaft 23 engages with the rotary disc 41 to frictionally transmit the rotation, and the rotary disc 41 transfers to the mounting rollers 15 and 16. When engaged, the rotation is frictionally transmitted. Further, in the rotation driving device 1 for a spherical body, the rotation due to the above-mentioned two frictional transmissions adjusts the pressing force of the contact, which is the engagement, so that the output shaft 23, the rotary disk 41, the rotary disk 41, and the mounting rollers 15, 16 are provided. Is provided with means for possible rolling contact. That is, it is as follows.

The rotary drive motor 20 is attached and fixed to the bracket 31 with screws 32. The bracket 31 is formed by notching the upper and lower sides of a substantially tubular shape, and is fixed to the shaft support plate 13 by a fixing screw 33. The through hole 34 through which the fixing screw 33 is inserted is a vertically long hole, and the bracket 31 can be fixed at any height.

Here, a pair of adjusting screws 35 abutting on the bracket 31 are screwed into the bottom plate 11, and the fixing height of the bracket 31 can be adjusted by adjusting the protruding length of each.

Also, the output shaft 23 inserted in the bracket 31 is a shaft support plate.
It is projected so as to be able to come into rolling contact with a turntable 41 which is rotatably arranged on the shaft 15.

Further, the turntable 41 is coaxially inserted into the hat screw 43 via the bush 42, and the set screw 44 is screwed into the tip.
It has been prevented from coming off. The hat screw 43 is attached to the shaft support plate 13 by a fixing screw 45 inserted from the opposite side. Here, the through hole 46 into which the fixing screw 45 is inserted is a vertically long hole, and the width thereof is formed to be slightly wider than that of the fixing screw 45, so that the fixing position of the rotary disc 41 can be adjusted.

As shown in FIG. 4, the rotary drive device 1 for a spherical body has a rotary disk.
41 is arranged immediately below between the pair of load rollers 15 and 16, and is fixed in a state of evenly rolling contact with the respective circumferential surfaces of the load rollers 15 and 16, and the output of the rotation drive motor 20. The rotational force transmitted from the shaft 23 is transmitted to both rollers 15 and 16 at the same time so that both rollers 15 and 16 are rotated at the same peripheral speed, and these constitute the synchronous drive means 5.

As shown in FIG. 1, the rotation driving device 1 for a spherical body is provided with a constricted portion 50 capable of engaging the spherical body 2 with a mounting roller 16.
The constricted portion 50 is configured such that the engagement surfaces 51 and 52 having a partially spherical shape are arranged to face each other, and a small-diameter connecting portion 53 that connects them is provided. Therefore, when the sphere 2 is supported on the roller 15 at one point and the constricted part 50 of the roller 16 is supported at two points, the sphere 2 placed on the constricted part 50 is synchronously rotated by the synchronous drive means 5. It is rotatably driven by each of the mounting rollers 15 and 16 and rotatable about an axis parallel to the rollers 15 and 16, but is held between the engaging surfaces 51 and 52 to restrict the movement along the rollers 15 and 16. To be done.

As shown in FIG. 5, in the constricted portion 50, the engaging surfaces 51 and 52 have a partially spherical shape, and the diameter of the sphere of the partially spherical shape is equal to the diameter of the roller 16 and the center of the sphere is It is formed on the rotation axis of the roller 16. Therefore, the engagement surfaces 51, 52
The circumference of is smoothly connected to the cylindrical surface of the mounting roller 16, and the sphere 2 mounted on the constricted portion 50 is always in contact with each of the engagement surfaces 51 and 52.

In the following, the use of the spherical rotary drive 1 will be explained.

First, one point of the sphere 2 on the roller 15 and the constricted portion 50 of the roller 16
Support rollers 15 and 16 so that they are supported by a total of two points above.
Place on. Here, since the spherical body 2 is stably mounted by so-called three-point support, it can rotate in the circumferential direction of the rollers 15 and 16, but the movement of the mounting roller 16 in the axial direction is restricted. The sphere 2 does not roll and move in the axial direction of the rollers 15 and 16.

Next, the synchronous drive means 5 is started, and the output shaft 23 of the rotary drive motor 20 is rotated to rotate the turntable 41 which makes a point contact with the turntable 41.
15 and 16 are driven to rotate at the same peripheral speed at the same time. The rollers 15 and 16 that are rotationally driven at the same peripheral speed respectively apply rotational driving force to the spherical body 2. Here, the portion of the sphere 2 supported by the roller 15 receives a rotational driving force of the above-mentioned peripheral speed in a circular shape having a radius of the sphere 2. That is, Laura 1
Let V be the same peripheral velocity of 5,16 and r ₀ be the radius of sphere 2,
Angular velocity V / in the circle part of radius r ₀ orthogonal to the rotation axis A ₁ of sphere 2
It is driven to rotate at r ₀ .

On the other hand, the part of the sphere 2 supported by the roller 16 is a constriction that supports the sphere 2 with respect to the above peripheral velocity in a circular shape having a radius that is the distance connecting this part and the rotation axis A ₁ of the sphere 2. The rotational driving force is received at the peripheral speed corresponding to the part of the spherical surface of the part 50. That is, the center of the sphere that is the basis of the partial curved surface of the constricted portion 50.
The line segment N connecting O ₂ and the center O _{1 of the} sphere 2 is the rotation axis of the roller 16.
When the angle formed with A ₂ is θ, the spherical body 2 is a portion where the center O ₁ of the spherical body 2 intersects with the rotation axis A ₁ at an angle θ, that is, a circular sphere with a radius r ₀ Sin θ centered on the rotation axis A _1. In part 2, VS
It is driven to rotate at a peripheral speed of inθ.

Here, when the rotational driving force received by the spherical body 2 from the constricted portion 50 is converted from the peripheral velocity V Sinθ to the angular velocity ω, V Sinθ = ω
・ Ω = V / r ₀ is obtained because r ₀ Sinθ.

From the above, the sphere 2 supports the roller 15 and the roller 16
Both of them are rotationally driven at the same angular velocity in the constricted portion 50 which is a supporting portion of the. Therefore, the sphere 2 stably rotates at a desired speed, and there is no problem in measuring the surface roughness of the sphere 2. The measurer can know the surface roughness of the sphere 2 which is stably rotating at a desired speed by the measuring device 3 by detecting from the contactor 4.

According to this embodiment, the following effects can be obtained.

That is, of the mounting rollers 15 and 16 on which the sphere 2 is mounted,
By forming the constricted portion 50 on one of the loading rollers 16,
By supporting the spherical body 2 downward at the pair of engaging surfaces 51 and 52 in a fitting manner, the movement of the mounting roller 16 in the axial direction, which is the direction orthogonal to the fitting direction, is restricted. Therefore, the sphere 2 is kept in a predetermined position, and the sphere does not move in the axial direction of the rollers 15 and 16.

In addition, the two opposing surfaces that form the constricted portion 50 are partial curved surfaces of a sphere whose center is located on the rotation axis of the mounting roller 16 and whose diameter is the same as the diameter of the roller 16.
Since the spheres 15 and 16 are configured to rotate at the same peripheral speed, the sphere 2 that is placed on the rollers 15 and 16 and driven to rotate is
Regardless of the diameters of the rollers 15 and 16, the peripheral speeds of the rollers 15 and 16, and the diameter of the sphere 2, the sphere 2 is a roller.
Both 15 and 16 receive the rotational driving force of equal angular velocity and rotate. Therefore, the sphere 2 stably rotates at a desired speed, and there is no hindrance in measuring the surface roughness of the sphere 2.

The pair of mounting rollers 15 and 16 can be rotated at the same peripheral speed by the synchronous drive means 5 including the rotary disk 41 and the rotary drive motor section 20 which are in rolling contact with each other.

Furthermore, since the angular velocities of the sphere 2 by the rollers 15 and 16 are automatically matched, it is not necessary to form a groove for engaging each of the pair of rollers as in the conventional case, and the grooves of both rollers are aligned. There is no need to make adjustments, etc., and manufacturing can be facilitated.

Further, since the loading rollers 15 and 16 are formed into a pair of rods extending in parallel, a cylindrical rotating body such as a cylinder or a cylinder is placed along each of these intervals, and the surface roughness of the peripheral surface is measured. It can also be widely used for surface measurements other than spheres.

On the other hand, in the synchronous drive means 5, the rotation drive motor 20
Since rolling contact is used for transmission of rotation from the output shaft 23 to the turntable 41 and the mounting rollers 15 and 16, the rotation can be smoothly transmitted, and play and unevenness of rotation or noise is generated. In addition to being able to reduce the amount, it is possible to perform a precise rotary feed operation. Therefore, it is possible to accurately synchronize the measurement data with the angular position in the surface roughness measuring device, and obtain a more accurate measurement result.

In addition, the rolling rollers 41, 15
Since the peripheral surfaces of the rollers 15 and 16 are driven, the peripheral velocities of the rollers 15 and 16 can be automatically matched, and there is no restriction on the size of the diameter of the mounting rollers 15 and 16, and the sphere 2 of a wide range can be used. Applicable to measurement.

The peripheral surfaces of the mounting rollers 15 and 16 and the engaging surfaces 51 and 52, or the rolling contact portions of the rotary disc 41 and the output shaft 23 of the rotary drive motor 20 are coated with a material having a large friction coefficient. Alternatively, a seat or the like may be attached, and the rotational force to be transmitted can be increased, and more reliable and accurate rotational drive can be performed.

Further, a ball bearing or the like may be appropriately interposed in the rotatably supporting portions of the turntable 41 and the mounting rollers 15 and 16, and the smoothness of the rotating operation can be further improved by reducing the rotation resistance. .

Further, the synchronous drive means 5 is the rotary disc 41 as in the above embodiment.
The structure is not limited to the one using the rotation driving motor 20, and in short, any structure may be used as long as the pair of mounting rollers 15 and 16 can be synchronously driven, and an optimal mechanism or the like may be adopted in actual practice.

On the other hand, the diameter dimensions, lengths, and materials of the mounting rollers 15, 16, the turntable 41, the output shaft 23, etc. may be set as required, and the rating and type of the rotary drive motor 20 and the shape of the frame 10 may be set. The material, material, etc. may be appropriately selected for implementation.

In particular, the outer diameters of the load rollers 15 and 16 may be changed at any time during measurement work, and the outer diameters of the rollers 15 and 16 may be different from each other. 15,16
Since the peripheral speed of (1) is naturally matched by the common turntable 41, stable driving of the sphere 2 can be maintained at all times.

Further, in the above-described embodiment, the loading rollers 15 and 16 each have a rod shape, and the constricted portion 50 is provided in the middle portion of one loading roller 16 so that the hemispherical engaging surfaces 51 and 52 are opposed to each other. The roller 16 and the engagement surfaces 51, 52 may be formed by other means.

For example, two spheres having the same radius are connected by a small-diameter connecting portion 53 to form a substantially hand-barbell-shaped mounting roller 16, and the mounting roller 15 is mounted so that the axes connecting the centers of both spheres are parallel to each other. You may arrange along. Such a load roller
In 16, the pair of engaging surfaces 51, 52 are formed by the hemispherical surfaces of the two spherical bodies facing each other. Here, the engagement surface 51,
The center of 52 is naturally the center of both spheres, and the radii of the engaging surfaces 51, 52 match the radii of the spheres, that is, the radius of the mounting roller 16 given by an imaginary peripheral surface enveloping both spheres. Therefore, by rotating and driving both spheres forming the mounting roller 16 so as to have the same peripheral velocity as the roller 15, the same effect as that of the above-described embodiment can be obtained, and the sphere 2 can be stably driven. Further, although it cannot be applied to a long rod-shaped member, further miniaturization is possible when specialized for measurement of a short cylindrical rotating body or sphere 2.

[Effect of device]

According to this invention, it is possible to hold the sphere to be rotationally driven in a fixed position and prevent the sphere from moving in the axial direction of the roller, and it is possible to stably rotationally drive at a desired speed. ing.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view showing an essential part of the embodiment, FIG. 3 is an exploded perspective view showing an essential part of the embodiment, and FIG. 2 is a sectional view taken along line IV-IV of FIG. 2, FIG. 5 is a side view showing an essential part of the embodiment, FIG. 6 is a top view showing a conventional example, and FIGS. FIG. 9 is a side view showing a main part of a conventional example, and FIG. 9 is a top view showing another conventional example. 1 ... Spherical rotation driving device, 2 ... Sphere, 5 ... Synchronous driving means, 15,16 ... Mounting roller, 20 ... Rotation driving motor, 41 ... Rotary disk, 50 ... Constriction section, 51, 52 ... Engaging surface.

Claims (1)

[Scope of utility model registration request] 1. A rotation driving device for a sphere, which supports and rotates a sphere for measuring the surface roughness of the sphere, comprising two rollers arranged axially in parallel and supporting and placing the sphere. And a rotation driving means that has a rotation driving motor and rotationally drives the two rollers in the same direction and at the same peripheral speed, and a constricted portion for supporting a sphere on either one of the two rollers. The two surfaces of the roller that are formed and that face the constricted portion and that face each other in the axial direction of the roller are centered on the axis of the roller that has the constricted portion and have the same diameter as the diameter of the roller that has the constricted portion. A rotation drive device for a sphere that is a partial curved surface of a sphere.