JP2890741B2 - Bearing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for adjusting an angle of a plane for assembling two elements such as a CCD (solid-state image sensor) and an LCD (liquid crystal display) in parallel. .

2. Description of the Related Art In recent years, in the process of bonding a color filter to an array substrate such as a CCD or LCD, the degree of parallelism between two components is required to be in the order of submicron, so high accuracy and high rigidity are required. A bearing device for adjusting the plane angle is required.

Hereinafter, an example of a conventional bearing device for plane adjustment will be described with reference to the drawings.

3 and 4 show a conventional bearing device.
In these FIG. 3, 1 is a first spherical ball bearing,
A convex spherical surface centering on the swing center 2 is formed.
Reference numeral 3 denotes a pin for preventing the rotation of the first spherical ball receiver 1 provided so as to be at the same height as the swing center 2. Reference numeral 4 denotes a second spherical ball bearing, which forms a concave spherical surface centered on the swing center 2 of the spherical ball bearing 1, and holds the spherical ball bearing 1 via the steel ball 5. The steel ball 5 is 12 ~ on the circumference concentric with the center of the spherical surface.
They are arranged at equal intervals of 15 months. Reference numeral 6 denotes a holder for the steel ball 5, which holds the steel ball 5 so as not to fall off. Reference numeral 7 denotes a rotation stopper having a u-shaped cross section for supporting the rotation stopper pin 3. Reference numeral 8 denotes a mounting portion for a workpiece (assembly) provided on the upper surface of the spherical ball receiver. Reference numeral 9 denotes a spring for pressing the spherical ball receiver 1 to the spherical ball receiver 4 via the steel ball 5;
Is a spring receiver for holding the spring. Numerals 12 and 15 denote actuators for urging the first spherical ball bearing, and press the lower flat portion provided on the spherical ball bearing 1. Reference numeral 13 denotes a tension spring, which is configured so that a flat portion of the lower portion of the spherical ball receiver 1 is pressed against the tip of the actuator so that there is no play. The steel ball 5 is preloaded by a spring 9. . The operation will be described below.

Work placement part 8 provided on the upper surface of first spherical ball receiver 1
When adjusting the angle of the
When the first spherical ball bearing 1 is supported by the spherical ball bearing 4 via the steel ball 5 when the first spherical ball bearing 1 is moved by a predetermined amount, the detent pins 3 are rotated around the swing center 2 by 14 and
It rotates in 16 directions, and the posture of the work placement unit 8 changes accordingly. At this time, the detent pins 3 and 14 and 16 are attached to the spherical ball bearing 1.
No displacement other than moving in the direction occurs. The steel ball 5 moves while rotating between the spherical ball bearings 1 and 4 with respect to the displacement of the spherical ball bearing 1.

However, in the above configuration, there is no problem when a load is applied in the preload direction by the spring 9, but when a load is generated in the opposite direction to the preload, the preload between the spherical ball bearings 1 and 4 is not increased. Has changed, and a high-precision plane adjustment cannot be performed.

In view of the above problems, an object of the present invention is to provide a bearing device that performs high-precision, high-rigidity plane angle adjustment regardless of the load direction.

Means for Solving the Problems In order to solve the above problems, a bearing device of the present invention comprises a first spherical ball bearing centered on one swing center and a first spherical ball receiver centered on the swing center. A third spherical ball bearing, which is moved integrally with the spherical ball bearing, is sandwiched between the first and second spherical ball bearings and has a spherical surface concentric with the swing center on both surfaces. And between the first and third spherical ball bearings and the second
And three or more steel balls are arranged at equal intervals on a circumference concentric with the center of the spherical surface between the first spherical ball bearing and the third spherical ball bearing. The steel ball is pre-loaded by a nut which is screwed into a threaded portion provided at the tip of a shaft which projects downward from the lower end of the shaft and penetrates the third and second spherical ball bearings.

Action According to the present invention, the steel ball sandwiched between the first spherical ball bearing, the second spherical ball bearing, and the third spherical ball bearing is uniformly applied with a preload by the above means, regardless of the direction of the load. A highly accurate and rigid bearing device for adjusting a plane angle can be realized.

Embodiment Hereinafter, a bearing device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a sectional view of a bearing device according to an embodiment of the present invention. In FIG. 1 (A), reference numeral 16 denotes a first spherical ball bearing, which is a swing center.
It has a convex spherical surface centered at 17. Reference numeral 18 denotes a second spherical ball bearing, which has a concave spherical surface centered on the swing center 17. 19 is a third spherical ball bearing. 20,21
Is a steel ball, which is substantially equidistant on the circumference concentric with the center of the spherical surface between the first and third spherical ball bearings and between the second and third spherical ball bearings by holders 22 and 23. Three or more pieces are held at intervals. A shaft 16a is provided below the first spherical ball bearing, and a male screw portion is provided near the tip of the shaft 16a. The shaft 16a connects the third spherical ball bearing 19 and the second spherical ball bearing 18 to each other. Nuts 24 and 25 are screwed into the male screw portion of the shaft 16a, and the first spherical ball bearing 16, the second spherical ball bearing 18 and the third spherical ball bearing 19 are connected to the steel balls 20 and 21 and the retainer. The steel balls 20 and 21 are tightened so as to assemble them together via 22 and 23 and at the same time to preload the steel balls 20 and 21. 26 is a mounting portion of an assembly provided on the upper part of the first spherical ball bearing, 27 is a detent pin provided at the same height as the swing center 17, and 28 is integrated with the spherical ball bearing 19. This is a stopper for the first spherical ball receiver 16 to be configured. FIG. 2 is a partial view of the bearing device viewed from below. 29 and 30 are actuators for moving the first spherical ball bearing 16, and 31 and 32 in FIG. 1 are directions in which the positioning pins can be moved by the actuator. Is shown. Reference numeral 33 denotes a spring for pressing the flat portion at the tip of the shaft 16a against the actuators 31 and 32.

The operation of the bearing device configured as described above will be described.

The fit between the outer diameter of the shaft 16a provided on the first spherical ball bearing 16 and the inner diameter of the through-hole of the second spherical ball bearing is an intermediate spring, and the first spherical ball bearing and the second spherical ball are engaged. The ball bearing is tightened by nuts 24 and 25 and moves together. Also, the inner diameter of the central through hole of the third spherical ball receiver is sufficiently larger than the outer diameter of the shaft 16a, and there is a gap between the through hole and the shaft 16a,
The shaft 16a can move in the gap.

On the other hand, FIG. 1 (B) shows a detent pin 27 and a detent fitting.
28 are shown. It is the fragmentary view of the bearing device of this invention which looked at the rotation stopper from the front. As can be seen from this figure, since the rotation of the detent pin 27 is restricted by the detent metal fitting 28 in the lateral direction, the detent pin 27 is centered on the point 17 as shown at 32 in FIG. Swinging up and down, and as shown at 31, the detent pin is allowed to move only to rotate. Therefore, the first spherical ball bearing 16 is the second spherical ball bearing.
The axis of the first spherical ball bearing 16 is integrated with the first spherical ball bearing 16 in a plane including the axis of the first spherical ball bearing 16 and the axis of the detent pin 27 and at right angles to the plane. It is possible to swing around the point 17 only in a plane including the axis of 16 and to swing in the two planes by the actuators 29 and 30 shown in FIG. Changes posture.

The bearing device which operates as described above is composed of the first spherical ball bearing 16, the second spherical ball bearing 18, and the third spherical ball bearing 19,
And steel nuts tightened with nuts 24 and 25 through 21
Since the preload is applied to 20 and 21, the rigidity is high enough to obtain the same accuracy regardless of whether the load applied to the mounting portion 26 is in the compression direction or the tension direction.

In this embodiment, the first, second and third spherical ball bearings 16, 18 are used.
And 19 are assembled via steel balls, but may be constituted by air bearings instead of steel balls.

EFFECT OF THE INVENTION As is apparent from the above description, the present invention provides a first spherical ball bearing having a spherical surface centered on one swing center and a second spherical surface having a spherical surface centered on the swing center. Ball receiver,
A third spherical ball bearing which is sandwiched between a first spherical ball bearing and a second spherical ball bearing via a steel ball or the like and has on both sides of a spherical surface centered on the swing center is formed. By adopting a structure in which the nut is tightened so as to apply a preload, the same accuracy can be obtained regardless of whether the load applied to the work mounting portion provided on the first spherical ball bearing is in the compression direction or the tension direction. It has sufficient rigidity and an accurate angle can be obtained, so it is effective in precision assembly processes.

[Brief description of the drawings]

1 (A) is a longitudinal sectional view of a bearing device according to an embodiment of the present invention, FIG. 1 (B) is a partial front view showing a detent portion of the device, and FIG. 2 is a view of the device from below. FIG. 3 is a longitudinal sectional view of a conventional bearing device, and FIG. 4 is a partial front view of the device as viewed from below. 16: 1st spherical ball bearing, 16a: axis, 17: swing center, 1
8 ... second spherical ball bearing, 19 ... third spherical ball bearing, 20,21 ...
... steel balls, 24, 25 ... nuts.

Claims (1)

(57) [Claims] A first spherical ball bearing having a convex spherical surface centered on the center of oscillation, an axis having an external thread near the tip in the center of the spherical surface, and a concave surface centered on the center of oscillation. Having a spherical surface and a hole in the center of the spherical surface through which the axis passes smoothly.
And one side centering on the center of the swing is sandwiched between the first spherical ball bearing and the second spherical ball bearing via a member such as a steel ball that eliminates the sliding friction force between the surfaces. Is formed by a third spherical ball bearing having a concave spherical surface with a convex spherical surface and a hole in which the shaft swings at the center of the spherical surface, and a nut screwed to a male screw portion near the shaft tip. A bearing device in which a first spherical ball bearing, a second spherical ball bearing, and a third spherical ball bearing are assembled so as to apply a preload to a member sandwiched between the spherical ball bearings.