JPH03260451A - Traveling device - Google Patents

Abstract

PURPOSE:To provide a moving device, which can be assembled easily and uncostly without requiring high accuracy, by forming rotatably at least either of a sphere, which is fixed to a transport piece and contacts a plurality of columns, and these columns provided at the conversion part. CONSTITUTION:A table 9 and nut 7 changing the rotational motion into straight motion are coupled together by point contacting of a plurality of columns 8 with a sphere 10 generated at the coupling part, and movement of the contact point at the sphere 10 is possible due to slide rotation. That is, the constraint which the nut 7 receives from the table 9 becomes only in the moving direction of the table 9. Thereby there is no more need for a screw shaft 4 to be parallel with a rail 6, and the linear motion of the table 9 is conducted without hindrance even in the event of twisting. Accordingly assembling of the screw shaft 4 etc. does not require high accuracy, and the feed table device concerned 1 can be assembled easily and uncostly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a movable device that performs linear motion through rotational motion.

In recent years, movable devices such as feed table devices having linear guide rails that convert rotational motion of a motor into linear motion using a ball screw nut have been commonly used.

In such a movable device, it is necessary to assemble the linear motion part and the rotary motion part with high precision, so a movable device with reduced assembly precision is required. Therefore, a coupling mechanism between the linear motion section and the rotation motion section is required to allow smooth movement even if the assembly is not performed with high precision.

[Conventional technology]

FIG. 3 shows a cutaway steel surface view of a conventional movable device.

FIG. 3 shows a moving device for the feed table, in which the table 30 is movably secured to two rails 33a, 33b on a base 31 by slide guides 32a, 32b. There are 7 lunges 34 on the back side of the table 30.
5, and a nut portion 36 is attached to the 7 flange 34. A ball 37 is placed around the hole in the axial center of the nut portion 36 (see FIG. 4), and the screw shaft 38 is engaged with it.

Further, FIG. 4 shows a configuration diagram of a coupling mechanism between the nut portion 36 and the screw shaft 38. The screw shaft 38 is connected to the support unit 39
It is attached to the motor via a bearing 40, and is rotated by a servo motor, pulse motor, etc. (not shown). Further, a threaded ring 38 is engaged with a ball 37 of the nut portion 36 in its groove.

Next, the operation of the movable @ position will be explained.

When the screw ring 38 rotates, the balls 37 on its groove roll along the groove. This moves the table 30 together with the nut portion 36 in the axial direction along the rails 33a, 33b. That is, the rotational movement of the screw shaft 38 is converted into the linear movement of the table 30.

In this case, the direction of movement of the table 30 is determined by the direction of rotation of the screw @38.

[Problem to be solved by the invention]

By the way, the slide guides 32a, 32b, 7 lunges 34. which are attached to the table 30. Since the nut portion 36 attached to the flange 34 is fixed with a screw or the like, there is no degree of freedom in assembly. For example, in the case of FIG. 3, the backlash between the nut portion 36 and the screw shaft 38 is 0.00.
Within 5 seconds, rails 33a, 33b and slide guide 32
The backlash with a and 32b is O, OG within 2 margins, and the rail 33a.

Variation in parallelism between 33b and screw shaft 38 is 0.005
If it is not within this range, the entire movement will not be carried out smoothly. Therefore, there is a problem in that high precision is required for assembling the rotary motion section and the linear motion wJ section in the movable device.

Therefore, the present invention was made in view of the above problems, and an object of the present invention is to provide a movable device that can be assembled without requiring high precision.

[Means to solve the problem]

The above-mentioned problem is to convert rotational motion into linear motion and to move the transport body by this linear motion.
A converting unit that converts IF shift into linear motion, a predetermined number of cylindrical bodies provided in the converting unit, and a spherical body fixed to the transfer body and in contact with each of the predetermined number of cylindrical bodies, This problem is solved by configuring at least one of the spherical body and the cylindrical body to be rotatable.

[Effect]

As mentioned above, the converter that changes rotational motion into linear motion and the transfer body are connected by point contact between a plurality of cylindrical bodies and a sphere in the connecting part, and the movement of the contact point on the sphere causes sliding rotation. This is possible. In other words, the conversion unit is constrained by the transfer body only in the direction of movement of the transfer body.

As a result, the screw shaft and the rail in the third arm (FIG. 4) do not need to be parallel, and even if twisting occurs, the linear movement of the transfer body can be performed without any problem.

Therefore, since high precision is not required in assembling the threaded ring, etc., the IJ device can be assembled easily and at low cost.

〔Example〕

FIG. 1 shows a configuration diagram of an embodiment of the present invention. Fig. 1 shows the part related to the rotational movement of the feed table device, which is an example of a movable device, and the part that engages in the movement.
Figure (A) is a plan view, Figure 1 (Btu front view, Figure 1 (C
) is a cutaway side view.

In the feed table assembly ff11 of FIG. 1, a screw shaft 4 supported on a pedestal 2 by a support unit 3 via a bearing (see j[) in FIG. 4) is rotated by a motor 5.

A rail 6 is provided on the pedestal 2. In this case, for the sake of explanation, the screw shaft 4 is not parallel to the rail 6,
In addition, it is assumed that twisting has occurred.

On the other hand, in the nut part 7 which is a converting part, a screw shaft 4 passes through the ring center part through a ball, and the ball engages with a thread groove of the screw shaft 4 (see nilth).

For example, four cylindrical bodies 8 are provided on the nut portion 7. Then, the spherical body 10 held in the table 9, which is a transporting body, comes into contact with the four cylindrical bodies 8. The cylindrical body 8 and the spherical body 10 constitute a connecting portion. Further, a slide guide 11 is provided on the back surface of the table 9, and slides while engaging with the rail 6.

Next, the operation of the feed table device w1 will be explained. First, when the screw shaft 4 is rotated by the motor 5, the nut portion 7 is moved linearly in the axial direction of the screw shaft 4 by the ball (see FIG. 4) engaged with the thread groove of the screw shaft 4. That is, the nut portion 7 converts the rotational motion of the screw shaft 4 into linear motion.

On the other hand, the four cylindrical bodies 8 and the spherical bodies 10 of the table 9 are in contact with each other, that is, they are in contact with each cylindrical body 8 at one point. Further, due to the shape of the sphere 10, the contact point can freely move on the sphere 10. Therefore, even if the screw shaft 4 is not parallel to the rail 6 and is twisted, as in the first WJ,
The movement of the nut portion 7 changes the contact point between the cylindrical body 8 and the spherical body 10 (the nut I!S7 changes the movement direction due to the parallelism and torsion by moving in the rotational direction).

That is, even if the positional relationship between the nut portion 7 and the table 9 changes, they follow each other and the table 9 smoothly moves linearly along the rail 6.

In this way, the threaded ring 4 is not parallel to the rail 6,
In addition, even if the table 9 is twisted, the table 9 can move smoothly in a straight line, so the mounting position between the rail 6 and the screw shaft 4 can be adjusted.
This is allowed with a general tolerance (for example, 0.1a or less), and the assembly work is easy without requiring high precision. Furthermore, high precision parts (eg, screw shafts) are not required. Furthermore, in the conventional movable device (Figs. 3 and 4), the table feeding accuracy is affected by the mounting accuracy of the nut and the rail, whereas in the present invention, the accuracy of the nut is not affected, and the rail The accuracy of only 1211 is 1211, and the feeding accuracy of the entire device can be improved.

Next, FIG. 2 shows an overall perspective view of the feed table device 11. Figure 2 shows that the table 9 is running on two rails 6 a
Although not shown in the figure, the rotary motion of the threaded ring 4 is caused to move linearly along the rail 6 via a connecting portion between the cylindrical body (8) and the spherical body (10). In addition,
The moving direction of the table 9 is the rotation direction of the motor 5 (screw @
4).

In addition, although the above embodiment shows a feeding table device as a movable device, the transfer body is not limited to a table, but can be applied to any device as long as it converts rotational motion into linear motion and moves. be.

(Effects of the Invention) As described above, according to the present invention, by providing the cylindrical body and the spherical body that abuts the cylindrical body in the connecting part that converts rotational motion into linear motion, the movable device can be moved without requiring high Wi degree. It can be assembled easily and at low cost.

4. IIQ on the board! Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is an overall perspective view of the feed table device in Fig. 1, Fig. 3 is a cutaway side view of a conventional movable device, and Fig. 4 is a diagram showing the structure of an embodiment of the present invention. It is a construction doctor showing a connecting part of a conventional mobile device.

In the figure, 1 is a feeding table device f (movable device f), 2 is a pedestal, 3 is a support unit, 4 is a screw shaft, 5 is a motor, 6 is the rail, 7 is Natsuto face (conversion wk), 8 is a cylinder, 9 is a table (transfer body); 10 is a sphere, 11 is slide guide shows.

Figure 1

Claims (1)

[Scope of Claims] A movable device that converts rotational motion into linear motion and moves a transfer body (9) by the linear motion, including a conversion section (7) that converts rotational motion into linear motion, and the conversion section. (7) a predetermined number of cylindrical bodies (8), and a predetermined number of cylindrical bodies (8) fixed to the transfer body (9);
), and at least one of the sphere (10) and the cylindrical body (8) is rotatable.