JPH05153790A - Micromotion rotating mechanism - Google Patents

Abstract

PURPOSE:To cope with an arbitrary diameter of a rotating shaft and to obtain a rotating range infinitely by mechanically synchronizing fixing and driving of the shaft in a mechanism for rotating the shaft. CONSTITUTION:A mechanism for rotating a rotating shaft 15 rotatably placed on a base by an incrementally driving method for continuously rotating it by repeating a fine rotational movement has a rotating shaft holding member 16 for pressurizing to fix the shaft 15, a rotating shaft holding and driving member 20 for pressurizing to fix the shaft 15 and frictionally driving the shaft 15, and two driving members mounted on the members 16 and 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine rotation mechanism for rotating an object position with high accuracy.

[0002]

2. Description of the Prior Art FIG. 3 shows, for example, Japanese Patent Laid-Open No. 58-139681.
2A and 2B are schematic configuration diagrams of a conventional rotary fine movement mechanism disclosed in Japanese Patent Publication No. JP-A-2003-264, where a is a plan view, b is a sectional view taken along the line AA of a, and c is a sectional view taken along the line BB of a. In the figure, reference numeral 1 is a rotary plate, and the rotary plate 1 is constituted by connecting first and second moving members 2 and 3 having a semi-circular plate shape by an elastic hinge 4. Actually, the moving member is formed by partially cutting out two outer peripheral portions of the disk which are symmetric with respect to the central axis of the disk and providing notches from the notch toward the central axis. The rotary plate 1 including the second and third and elastic hinges 4 is formed. The rotary plate 1 is movably mounted on a base 5 and has an elastic hinge 4 at the center thereof.
The center of rotation is defined by the pin 6 provided on the lower surface of the. First and second drive members 7 and 8 are provided in the cutout portion of the rotary plate 1, respectively. Each of these driving members 7 and 8 is composed of a piezoelectric element that expands and contracts according to an applied voltage, and the first and second moving members 2 and 3 are provided at both ends in the expansion and contraction direction (arrow direction shown in the figure). Each is fixed. On the other hand, above the rotary plate 1,
First and second fixing members 9 and 10 made of piezoelectric elements similar to the driving members 7 and 8 are provided, respectively. One ends of the fixing members 9 and 10 in the expansion / contraction direction are fixed to fixed shafts. When the fixing members 9 and 10 are applied with a voltage, the rotating plate 1 is pressed and fixed on the base 5 at the other end (free end).

Next, the operation will be described with reference to FIG.
First, the second fixing member 10 is extended and the second moving member 3 is pressed and fixed onto the base 5. In this state, the first drive member 7 is extended and the second drive member 8 is extended.
To stretch. As a result, the first moving member 2 is moved to the position shown in FIG.
As shown in (a), the elastic hinge 4 is slightly rotated in the direction of arrow P about the hinge 4 due to the strain. next,
The first fixing member 9 is extended to fix the first moving member 2 on the base 5, and then the second fixing member 10 is extended to release the fixing of the second moving member 3. In this state, the first fixing member 7 is extended and the second driving member 8
Is extended, the second moving member 3 makes a minute rotation in the direction of arrow P about the elastic hinge 4 as shown in FIG. 4 (b). By repeating the above operation, the rotating plate 1 composed of the first and second parts is rotated in the arrow P direction about the pin 6 due to the strain of the elastic hinge 4.

[0004]

As described above, since the function of rotating the rotary shaft and the function of fixing the rotary shaft are independent of each other in the conventional rotary fine motion mechanism, the driving mechanism including the piezoelectric element associated with the above function is used. Since at least four members are required, it is not easy to synchronize the fixing of the rotating shaft and the driving, and since the driving member is inserted in the rotating shaft, the size of the rotating shaft is large. However, the rotation shaft diameter and the rotation range were limited.

The present invention has been made to solve the above problems, and a rotary shaft holding member for pressing and fixing a rotary shaft, and a rotation for pressing and fixing the rotary shaft and frictionally driving the rotary shaft. By configuring the shaft holding drive member with two integrated drive members, the rotation shaft can be mechanically fixed and the drive can be synchronized, and the rotation fine movement mechanism itself can be arranged on the circumference of the rotation shaft to allow arbitrary rotation. An object of the present invention is to provide a fine rotation mechanism capable of responding to a shaft diameter and having an infinite rotation range.

[0006]

SUMMARY OF THE INVENTION A rotary fine movement mechanism according to the present invention includes a rotary shaft holding member that is supported by a base and press-fixes a rotary shaft, and a rotary shaft that press-fixes and frictionally drives the rotary shaft. The rotary shaft holding drive member is composed of a rotary shaft holding member and a total of two drive members mounted on the rotary shaft holding drive member.

[0007]

According to the present invention, a rotary shaft holding member for pressing and fixing the rotary shaft, and a rotary shaft holding member for fixing the rotary shaft under pressure and frictionally driving the rotary shaft to be integrated with the rotary shaft holding member and driven in a reverse phase. The drive member is driven by a total of two drive members respectively mounted on the rotary shaft holding member and the rotary shaft holding drive member, and finely rotates by frictionally driving an arbitrary position of the rotary shaft, and this fine motion rotation is repeated. As a result, the rotating shaft is rotated by the stepwise motion drive for continuous rotation.

[0008]

EXAMPLES Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration plan view of a rotary fine movement mechanism. In the figure, 11 is a drive unit a, which is an elastic hinge a.
A rotary shaft holding member 16 for fixing the rotary shaft 15 is connected to the drive unit a11 via an elastic hinge b14. 17 is a drive unit b
Is connected to the drive part a11 via an elastic hinge c18, and the drive part b17 is connected to a rotary shaft holding drive member 20 for fixing and rotating the rotary shaft 15 via an elastic hinge d19. .. Reference numeral 21 denotes a driving member a, one end of which is connected to the driving portion a11 and the other end of which is the base 1.
The drive member a21 is driven by the elastic hinge a12 as a fulcrum when the drive member a21 expands and contracts. One end of the drive member b22 is connected to the drive part a11, and the other end is connected to the drive part b17. The drive member b22 expands and contracts to drive the drive part b17 with the elastic hinge c18 as a fulcrum. The driving members a21 and b22 may be composed of, for example, piezoelectric elements that expand and contract according to the applied voltage. The rotary shaft holding member 16 and the rotary shaft holding drive member 20 are
While fixing the rotating shaft fixing surface 16 on the tangent line of the rotating shaft outer periphery passing through the elastic hinge a12 so as not to rotate carelessly.
a and 20a are formed. The rotary shaft fixing surface 20a of the rotary shaft holding drive member 20 is perpendicular to the straight line B connecting the elastic hinge c18 and the center of the rotary shaft 15 so that the rotary shaft 15 can be moved tangentially to the outer circumference of the rotary shaft 15 when the rotary shaft 15 is rotated. It is also a face. The fixed surfaces 16a and 20a may fix the rotary shaft 15 at arbitrary positions on the side surface of the fixed shaft. The rotary shaft 15 is rotatably installed so as to be sandwiched between the rotary shaft holding member 16 and the rotary shaft holding drive member 20, and due to expansion and contraction of the drive member b22, friction with the rotary shaft holding drive member 20 occurs. It can be rotated. The rotary shaft 15 may be installed using either a pin or a bearing. Further, the elastic hinge may be either a leaf spring or a combination of a rotation supporting element such as a pin and a bearing and a spring element.

Next, the operation of the rotary fine movement mechanism configured as described above will be described. FIG. 2A shows a driving member a21.
Is extended, the driving portions a11 and b17 are driven around the elastic hinge a12 as a fulcrum, the rotary shaft holding member 16 contacts the rotary shaft 15, and the rotary shaft 15 is fixed by the elastic force of the elastic hinge b14. By contracting the drive member a21 from this state, the drive parts a11 and b17 move around the elastic hinge a12 as a fulcrum, and the rotary shaft holding drive member 20 contacts the rotary shaft 15 as shown in FIG. 2B. Then, as shown in FIG. 2C, the rotary shaft holding member 16 is rotated by the rotary shaft 15
Away from the rotary shaft 15 by the elastic force of the elastic hinge d19.
Is fixed. At this time, the rotation shaft holding member 16 is moved from the rotation shaft 15 until the rotation shaft holding drive member 20 comes into contact with the rotation shaft 15 by the elasticity of the elastic hinge b14 and the fixing force starts to be applied to the rotation shaft 15 by the elastic force of the elastic hinge d19. It doesn't leave. Next, by extending the drive member b22, the drive portion b17 moves about the elastic hinge d19 as a fulcrum, and the rotary shaft holding drive member 20 is rotated by the frictional force with the rotary shaft 15 as shown in FIG. Rotate 15 in the direction of the arrow. Next, the drive member a21 is extended to drive the drive portion a1 with the elastic hinge a12 as a fulcrum.
1 and b17 move, the rotary shaft holding member 16 contacts the rotary shaft 15 as shown in FIG. 2 (e), and then the rotary shaft holding drive member 20 comes out of the rotary shaft 15 as shown in FIG. 2 (f). The rotating shaft 15 is separated and fixed to the rotating shaft holding member 16 by the elastic force of the elastic hinge b14. At this time, the rotation shaft holding drive member 20 is moved from the rotation shaft 15 until the rotation shaft holding member 16 contacts the rotation shaft 15 due to the elasticity of the elastic hinge d19, and the fixing force starts to be applied to the rotation shaft 15 by the elastic force of the elastic hinge b14. It doesn't leave. By contracting the driving member b22 from this state, the driving portion b17 is driven with the elastic hinge c18 as a fulcrum, and the state returns to the state of FIG. 2 (a). By repeating the above procedure, the rotary shaft 15 is rotated. By performing the above procedure in the reverse order, it is possible to rotate the rotating shaft 15 in the direction opposite to the direction in which the rotating shaft 15 is rotated in the above procedure. In the above embodiment, the rotation shaft 15 is fixed and frictionally driven at any position on the side surface of the rotation shaft, but the same is true even if any position on the upper and lower surfaces of the rotation shaft is driven and fixed.

[0010]

As described above, according to the present invention, the rotary shaft holding member for pressing and fixing the rotary shaft and the rotary shaft holding drive member for pressing and fixing the rotary shaft and frictionally driving the rotary shaft are integrated. This structure can be configured with a total of two drive members, so that the rotation shaft can be fixed and the drive can be synchronized mechanically, which facilitates the operation. Also, by arranging the fine rotation mechanism itself on the circumference of the rotation shaft. It is possible to correspond to an arbitrary rotation shaft diameter and to make the rotation range infinite.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a rotary fine movement mechanism according to an embodiment of the present invention.

2A to 2F are explanatory diagrams showing driving states of the above-described embodiment.

3A to 3C are schematic configuration diagrams showing a conventional rotary fine movement mechanism.

4A and 4B are explanatory views showing a driving state of a conventional rotary fine movement mechanism.

[Explanation of symbols]

 11 drive part a 12 elastic hinge a 13 base 14 elastic hinge b 15 rotating shaft 16 rotating shaft holding member 17 driving part b 18 elastic hinge c 19 elastic hinge d 20 rotating shaft holding driving member 21 driving member a 22 driving member b

Claims (2)

[Claims] 1. A mechanism for rotating a rotary shaft rotatably mounted on a base by using a stepwise motion drive method of continuously rotating by performing fine movement rotation, the mechanism being supported by the base. A rotary shaft holding member that press-fixes the rotary shaft, and a rotary shaft holding drive member that is integrated with the rotary shaft holding member that press-fixes the rotary shaft and finely rotates by frictionally driving an arbitrary position of the rotary shaft. And one drive member for operating the rotary shaft holding member and the rotary shaft holding drive member in the same phase, and one drive member for driving the rotary shaft holding drive member for finely rotating the rotary shaft. Characteristic rotary fine movement mechanism. 2. Connected to a base via an elastic hinge a,
And a drive unit a to which a rotary shaft holding member for fixing the rotary shaft is connected via an elastic hinge b, and a drive unit a connected to the drive unit a via an elastic hinge c and a rotary shaft via an elastic hinge d. A drive part b connected to a rotary shaft holding drive member for fixing and rotating, a drive member a having one end connected to the drive part a and the other end connected to a base, and one end connected to the drive part a. A drive member b having the other end connected to the drive portion b is provided, and the rotary shaft holding member and the rotary shaft holding drive member have a rotary shaft fixing surface formed on a tangent line of the outer circumference of the rotary shaft passing through the elastic hinge a. The rotary fine movement mechanism, wherein the rotary shaft fixing surface of the rotary shaft holding drive member forms a surface perpendicular to a straight line connecting the elastic hinge c and the center of the rotary shaft.