JPH081472A - Mobile member moving device - Google Patents

Abstract

PURPOSE:To prevent transmission of abnormal torque caused by the movement of a screw, to a mobile member and deformation of the same by providing a parallel spring holder for fitting and fixing a feed screw and a female screw together in their center parts. CONSTITUTION:A parallel spring holder 5 is composed of a female screw holding part 5A for fitting and fixing a female screw at its center part thereof, and parallel springs 5B connecting between the holding part 5A and a mobile member holding part 5C. When a motor is driven so as to rotate a male screw 4, the female screw 3 is moved, and accordingly, power is transmitted to the female screw holding part 5A, the parallel springs 5B and the mobile member holding part 5C so that a mobile member is moved left and right. At this stage, the parallel springs 5B absorb eccentricity between the male screw 4 and the female screw 4, and a displacement caused by a curve of the male screw 4. Further, an auxiliary guide 6 absorbs abnormal torque exerted on the male screw 4 together with the above displacement. Therefore, it is possible to greatly enhance the accuracy of movement of the mobile member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing abnormal torque transmission and displacement to a moving body caused by movement of a feed screw.

[0002]

2. Description of the Related Art As shown in FIG. 3, since a moving body 31 is moved left and right, a female screw 32 connected to a lower portion of the moving body 31 is screwed into a male screw 33, and the male screw 33 is not shown via a bearing 34. It is connected to the electric motor. The moving body 31 is moved by the rotation of the electric motor, and the power is transmitted to the male screw 33 and the female screw 32.

[0003]

However, with the rotation of the male screw 33, the male screw 33, the female screw 32, and the moving body 31.
Abnormal torque and displacement due to machining and assembling errors occur in the direction perpendicular to the male screw 33, and the movement of the moving body 21 becomes discontinuous. Therefore, a male screw 33 having no bending is used. The misalignment between the male screw 33 and the female screw 32 is reduced.
It is also necessary to take measures such as reducing the misalignment between the bearing 34 and the female screw 32.

However, since there is a difference of 2 to 4 digits between the numerical value obtained by these measures and the required motion accuracy, there is a gap between the female screw 32 and the moving body 31 in the feeding direction as shown in FIG. Only the parallel spring 41 having rigidity is used.

However, even if the parallel spring 41 absorbs the displacement caused by the bending of the male screw 33, the rotational force applied to the female screw 32 for moving the moving body 31 acts on the moving body 31 as it is, so that the motion accuracy is poor. It is often humiliated.
In addition, the misalignment between the female screw 32 and the male screw 33, and the auxiliary guide 5 for absorbing the rotational force and displacement due to the bending of the male screw 33
1 is provided on the female screw 32 as shown in FIG.
It is also possible to connect the moving body 31 with the moving body 31, but the movement accuracy of the auxiliary guide 51 will impair the movement accuracy of the moving body 31, and it is difficult to obtain the required accuracy.

In view of this point, an object of the present invention is to provide a moving body moving device that prevents abnormal rotational force transmission and displacement to the moving body caused by the movement of the feed screw.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a moving device for an ultra-precision moving body, wherein a feed screw consisting of a male screw and a female screw to be engaged with the male screw, and a female screw at its central portion. The moving body moving device is characterized in that it comprises a parallel spring holding body which is fitted and fixed by and a supplementary guide which holds the parallel spring holding body.

[0008]

When the male screw rotates, the female screw moves, and along with this, the power is transmitted to the parallel spring holder. At this time, the parallel spring holder and the auxiliary guide absorb the misalignment between the internal thread and the external thread, the displacement caused by the bending of the external thread, and the abnormal rotational force applied to the external thread.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. The moving body 1 moves left and right as shown in FIGS. 1 and 2, and its rear end is connected to a moving body supporting portion 5C, which is a component of the parallel spring holding body 5 located under the moving body 1, with a bolt 2. are doing. The parallel spring holder 5 has a female screw holder 5A for inserting and fixing the female screw 3 at its center, a parallel spring 5B for connecting the female screw holder 5A and the moving body holder 5C described above, and a moving body holder 5C. It consists of
The structure is such that the displacement between the male screw 4 fitted to the female screw 3, the female screw 3 and the moving body 1 is absorbed.

The parallel spring holder 5 is connected to the bracket 7 at its rear end, and the lower end of the bracket 7 has an abnormal rotational force transmitted from the male screw 4 to the moving body 1 via the female screw 3 and the male screw 4. , The female screw 3 and the auxiliary guide 6 for preventing displacement between the moving bodies 1.

The mobile unit moving apparatus configured as described above operates as follows. When the male screw 4 rotates by the rotation of an electric motor (not shown), the female screw 3 moves, and along with this, power is transmitted to the female screw holding portion 5A, the parallel spring 5B, and the moving body holding portion 5C, and the moving body 1 moves in the left-right direction. Is possible.
At this time, the parallel spring 5B has a misalignment between the female screw 3 and the male screw 4,
The displacement caused by the bending of the male screw 3 is absorbed, and further, the auxiliary guide 6 absorbs an abnormal rotational force applied to the male screw 3 together with the upward displacement, so that the motion accuracy of the moving body 1 is significantly improved.

[0012]

As described above, according to the moving body moving device of the present invention, it is possible to prevent the abnormal transmission and displacement of the rotational force to the moving body caused by the movement of the screw.

[Brief description of drawings]

FIG. 1 is a diagram showing a front view of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a diagram showing a conventional technique.

FIG. 4 is a diagram showing a conventional technique.

FIG. 5 is a diagram showing a conventional technique.

[Explanation of symbols]

 1 Moving body 3 Male thread 4 Female thread 5 Parallel spring holder 6 Auxiliary guide 7 Bracket

Claims (1)

[Claims] 1. In a moving device for an ultra-precision moving body, a feed screw consisting of a male screw and a female screw to be screwed with the male screw, a parallel spring holder for fitting and fixing the female screw at its center, and a parallel spring holder. And a supplementary guide for holding the movable body moving device.