JPH0389038A - Jogging guide mechanism - Google Patents

Abstract

PURPOSE:To reduce restoring force in the guided direction accompanied by elastic deformation and enable the decrease in movement in the orthogonal direction to the guided direction and the increase in allowable load by generating force in the opposite direction to the restoring force caused by the elastic deformation of a spring accompanied by the displacement of a movable body by a magnetic force generating means. CONSTITUTION:Permanent magnets 11, 12 and 13, 14 are respectively disposed in mutually reversed polarity, and the permanent magnets 11, 13 and 12, 14 are disposed in the state of mutual like-poles facing each other. Permanent magnets 17, 18 and 15, 16 are disposed likewise in mutually reversed polarity, and the permanent magnets 15, 17 and 16, 18 are disposed in the state of mutual like-poles facing each other. Magnetic resiliency in the Y direction does not act upon the outside in the case of fixed plates 3, 4 being connected. On the other hand, the combined force of spring restoring force accompanied by the displacement of a movable plate 5 and magnetic force (force in the X direction) generated by the permanent magnets 11-18 can be made close to zero. The outer force required to displace a movable body can be therefore reduced.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a fine movement guide mechanism used as a relatively short stroke linear guide or a fine movement table guide mechanism, and particularly relates to a fine movement guide mechanism used as a guide mechanism for a relatively short stroke linear guide or a fine movement table. The present invention relates to an improvement in a mechanism for guiding a movable body in a specific direction of movement by interposing a spring in the spring and elastically deforming the spring.

(Prior art) A mechanism for properly arranging plate springs or wire springs and guiding a movable body in a specific direction according to the arrangement of the springs is a guidance mechanism that utilizes the deflection of the springs, so there is no friction due to sliding or transfer. It is known as a means of achieving smooth movement without resistance or wear. A typical example of this type of fine movement guide mechanism is the configuration shown in FIG.

In FIG. 5, leaf springs 1 and 2 are formed into the shape shown and are fixed to both ends of two fixed plates 3 and 4 and a movable plate 5. As shown in FIG. The fixed plates 3 and 4 are connected by means not shown and fixed relative to the coordinate system to be observed. The movable plate 4 can be relatively easily moved in the X direction in the figure by the deflection of the leaf spring 1.2. Y direction and Z direction of movable plate 4
Since the leaf spring 1.2 has a shape that makes it difficult to bend against movement in this direction, the movement is effectively restrained. Regarding the characteristics of a specific example of such a guide mechanism, see, for example, "Kano,
Hasebe, Ito, Huang, Yamada: “Operating Characteristics of Linear DC Motor Using New Support and Position Detection Mechanism” IEEJ Linear Drive Study Group Materials, LD-88-22, 1988J
is described in detail.

(Problems to be Solved by the Invention) The guide mechanism targeted by the present invention utilizes the elastic deformation of a spring, so the restoring force of the spring generates a force that returns the movable body to its original position against movement in the guide direction. It has the disadvantage of being In addition, in the mechanism shown in Fig. 5, the movement in the Y and Z directions perpendicular to the guide direction can be further reduced, and
If the thickness of the leaf springs 1 and 2 is increased in order to increase the allowable load in the Z direction, the restoring force generated in the guide direction will also increase.

The purpose of the present invention is to reduce the restoring force in the guide direction due to elastic deformation in the above-mentioned fine movement guide mechanism that utilizes elastic deformation of a spring, reduce movement in a direction perpendicular to the guide direction, and increase allowable load. The goal is to provide a means to make this possible.

(Means for Solving the Problem) Therefore, in the present invention, a spring is interposed between a fixed body and a movable body, and in a mechanism that guides the movable body in a specific movement direction by elastic deformation of this spring, a permanent magnet is used. A magnetic force generating means for generating a magnetic attraction and repulsion force is disposed between the fixed body and the movable body, and a force in a direction opposite to the restoring force due to the elastic deformation of the spring due to the displacement of the movable body is the magnetic force. It is configured to be generated by a generating means.

(Function) When an external force is applied to displace the movable body in the guiding direction, a restoring force of the spring is generated in a direction opposite to the direction of displacement, and a force in the direction of displacement is generated by the magnetic force generating means: The spring restoring force and the magnetic force cancel each other out, and the difference between the forces is the external force necessary to displace the movable body.

(Embodiment) FIG. 1 shows the main parts of a fine movement guide mechanism according to a first embodiment of the present invention. The basic configuration is the same as that in FIG. 5, and the fixed plates 3 and 4 are connected by means not shown and fixed relative to the coordinate system to be observed.

The movable plate 4 can be relatively easily moved in the X direction in the figure by the deflection of the leaf springs 1 and 2. With respect to the movement of the movable plate 4 in the Y direction and the two directions, the leaf spring 1.2 has a shape that makes it difficult to bend, so that the movement is effectively restrained. The following magnetic force generating means is added to this basic configuration.

That is, FIG. 1 is a cross-sectional view of the guide mechanism shown in FIG. 5 in which the magnetic force generating means according to the present invention is incorporated, taken from the direction A in FIG. 5. In Figure 1, 11~
18 are permanent magnets, each of which is magnetized in the direction of the arrow in the figure. Permanent magnets 11 and 12 are arranged on the lower surface side of fixed plate 3 in opposite polarity directions, and permanent magnets 13 and 1
4 are arranged on the upper surface side of the movable plate 5 with opposite polarities, and permanent magnets 11 and 13 and permanent magnets 12 and 14 are arranged with their same polarities facing each other.

Similarly, permanent magnets 17 and 18 are arranged on the upper surface of the fixed plate 4 in opposite polarity directions, and permanent magnets 15 and 16 are arranged on the lower surface of the movable plate 5 in opposite polarity directions. The permanent magnets 15 and 17 and the permanent magnets 16 and 18 are arranged so that the same poles face each other. One is a yoke plate that magnetically connects the back sides of the two permanent magnets.

With this arrangement, the permanent magnets 13 to 16 of the movable plate 5, the permanent magnets 11 and 12 of the fixed plate 3, and the magnet 1 of the fixed plate 4
7.18, a repulsive force in the Y direction and a magnetic force in the X direction are generated. If the fixed plate 3 and fixed plate 4 are connected, the magnetic repulsion force in the Y direction cancels each other out and does not act on the outside. The magnetic force in the X direction is generated as follows as the movable plate 5 is displaced from the neutral point in the X direction.

FIG. 2 shows the characteristics of the spring restoring force accompanying the displacement of the movable plate 5 and the magnetic force (force in the X direction) caused by the permanent magnets 11 to 18. The spring restoring force f is f−-kx with respect to the displacement amount
(k is a positive constant). On the other hand, permanent magnet 1
The magnetic force in the X direction generated by 1 to 18 is x-0, f
Within a predetermined range near −0, the force is in the opposite direction to the spring restoring force.

In other words, it becomes F-px (p is a positive constant). And f
-F is the force required to displace the movable plate 5 by X. This resultant force f-F can be made close to zero within a certain range by configuring the constant to be approximately equal to 5p.

FIG. 3 shows the configuration of a second embodiment of the present invention. Here, three permanent magnets 21, 22, 2 are placed on the upper surface side of the movable plate 5.
3 (magnetized in the direction of the arrow) is arranged, and an attraction plate 27 made of a high magnetic permeability material is attached to the lower surface side of the movable plate 3 facing this, and the attraction plate 27 is opposed to the central magnet 22. I'm letting you do it.

Similarly, three permanent magnets 24°25.
26 are attached, and a suction plate 28 is attached to the upper surface side of the fixed plate 4 facing the magnet 25 so as to face the magnet 25. Two yoke plates are placed on the back side of each magnet set. In this configuration, between the attraction plate and the magnets 21 to 26,
An attractive force in the Y direction and a magnetic force F in the X direction shown in FIG. 4 are generated. As shown in FIG. 4, the displacement fik x of the movable plate 5
Within a predetermined range near the neutral point of -0, a magnetic force F-px is generated as described above, and can cancel out the spring restoring force f.

The configurations shown in FIGS. 1 and 3 both show the minimum unit of the magnetic force generating means intended by the present invention. Guidance direction i.e. first
Even if a plurality of magnetic force generating means disclosed in the present invention are arranged in the X direction in FIGS.

(Effects of the Invention) As explained in detail above, in the fine movement guide device according to the present invention, the spring restoring force generated with the displacement of the movable body is canceled by the magnetic force generated by the magnetic force generating means, and the movable body The external force required to displace the is reduced by that amount. Therefore, it is possible to increase the thickness of the spring in order to increase the movement or permissible load in the direction perpendicular to the guiding direction without increasing the restoring force appearing on the outside, and the guiding performance can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the fine movement guide mechanism according to the first embodiment of the present invention (a cross section at the position of plane S in FIG. 5, viewed from direction A), and FIG. 2 is a view of the configuration of FIG. 1. FIG. 3 is a longitudinal sectional view of a fine movement guide mechanism according to a second embodiment of the present invention, FIG. 4 is a characteristic diagram of the configuration of FIG. 3, and FIG. 5 is a perspective view of a conventional fine movement guide mechanism. (An embodiment of the present invention is shown in FIG. 5 in which a magnetic force generating means is added). 1.2...Plate spring 3.4...Fixed plate 5...Movable plate 11-18...One permanent magnet...Yoke plate 21-26. ... Permanent magnet 27.28 ... Attraction plate 29 ... Yoke plate

Claims (3)

[Claims] (1) In a mechanism in which a spring is interposed between a fixed body and a movable body, and the elastic deformation of this spring guides the movable body in a specific direction of movement, magnetic force is generated by a permanent magnet to generate magnetic attraction and repulsion. A means is disposed between the fixed body and the movable body, and the magnetic force generating means generates a force in a direction opposite to the restoring force due to the elastic deformation of the spring as the movable body is displaced. Fine movement guide mechanism. (2) The fine movement guide mechanism according to claim 1, wherein the magnetic force generating means is arranged such that a permanent magnet arranged on the movable body and a permanent magnet arranged on the fixed body repel each other. . (3) The magnetic force generating means has a permanent magnet disposed on one of the fixed body and the movable body and an attraction plate made of a high magnetic permeability material on the other, and the force generated by the spring is zero. 2. The fine movement guide mechanism according to claim 1, wherein the permanent magnet and the suction plate generate a force in a direction opposite to the restoring force of the spring in a predetermined range near a certain position. .