JPH06159466A - Rectilinear guide drive device - Google Patents

Abstract

PURPOSE:To provide a highly reliable rectilinear guide drive device having a simple structure, by eliminating complicated mechanisms for removing backlash. CONSTITUTION:Guide rollers 2, four in total, are attached to a first frame member 1, at least two of them being attached to the upper part of the member 1, and at least two being attached to the lower part of the member 1. The two guide rollers 2 are made into rolling contact with a guide rail 10 while the other two guide rollers 2 are made into rolling contact with a second guide roller 11. These first and second guide rails 10, 11 are attached to a second frame member in parallel with each other, A rack 12 is attached to the first guide frame 10 on the side remote from the guide rollers, and is meshed with a pinion 5 rotatably attached to the first frame 1 so that the second frame member 2 is rectilinearly moved, relative to the first frame member 1 when the pinion 5 is rotated. A guide roller 5 is attached to the first frame member 1 through the intermediary of an eccentric roller shaft so that the rotational center position of the guide roller 5 may be finely adjusted by turning the eccentric roller shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear guide drive device.

[0002]

2. Description of the Related Art Generally, as a guide drive device for a long-distance linear motion, there is a device using a rack and a pinion as shown in FIGS. 4 and 5, four V-grooved guide rollers 2 are attached to the first frame member 1, while two guide rails 4 are attached to the second frame member 3 (see FIG. 5) to provide the above guide. The roller 2 is brought into rolling contact with the guide rail 4 so that the first frame member 1 and the second frame member 2
The frame members 3 are configured so that they can move linearly relative to each other. Further, a pinion 5 is rotatably attached to the first frame member 1, while a rack 6 is attached to the second frame member 3 in parallel with the guide rail 4 so that the pinion 5 is engaged with the rack 6. The pinion 5 is appropriately rotated by the rotation driving means and is rolled along the rack 6, so that the first frame member 1 and the second frame member 3 are linearly moved relative to each other. The pinion 5 is elastically pressed against the rack 6 by a spring type pressure mechanism 8 via a swing arm 7 swinging around a support shaft 7a. The guide roller 2 guiding the rail 4 along the rack 6 is
Although appropriately rotatably fixed by a fixing bolt, the other two guide rollers 2 are eccentric roller shafts 2a,
The rotation center position is attached so that it can be finely adjusted.

Further, conventionally, there is another linear guide drive device using a rack and a pinion as shown in FIG. In FIG. 6, a pinion 9 different from the conventional pinion 5 is provided, and a predetermined rotational force is applied in a direction opposite to the pinion 5. Also in the guide roller 2 of this conventional example, the upper two guide rollers 2 are fixed, and the lower two guide rollers 2 are attached by an eccentric roller shaft 2a so that they can be finely adjusted.

By the way, the drive by the rack and the pinion has a problem that the linear movement cannot be accurately controlled because there is backlash (play) in the meshing portion thereof. Therefore, the momentum of the linear motion (stop position) is 1/10
In the case of controlling in the unit of mm, it is necessary to take some measures to minimize the above-mentioned backlash.

As a method of removing the backlash, the above-mentioned FIG.
In the conventional examples shown in and 5, the pinion 5 is always pressed against the rack 6 with a constant force.
In the conventional example shown in FIG. 6, the backlash removing pinion 9 is used in addition to the driving pinion 5.

The above-mentioned conventional measures against backlash are based on the premise that it is difficult to guarantee the parallelism between the guide rail and the rack over the entire length of the moving range. Therefore, the above-mentioned complicated and expensive measures are required. The mechanism was adopted.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and its object is to omit the complicated mechanism for removing backlash as in the prior art. Another object of the present invention is to provide a highly reliable linear guide drive device having a simple structure.

[0008]

According to the linear guide drive device of the present invention, at least two guide rollers are attached to the first frame member, two guide rollers at each of the upper and lower sides, and one of the two guide rollers is attached to the first guide rail. And the other two guide rollers on the second guide rail, and the first and second guide rails are attached to the second frame member in parallel with each other. A rack is integrally formed on the opposite side of the rail, and the rack is rotatably driven by engaging a pinion rotatably attached to the first frame to linearly move the second frame member with respect to the first frame member. It is characterized in that it is configured to. The guide roller is attached to the first frame member via an eccentric roller shaft, and the eccentric roller shaft is rotated to finely adjust the rotation center position of the guide roller. A V groove is formed around the guide roller, and
The rail is formed with an inverted V-shaped cross section that fits the rail.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, 1 is the first
As a frame member, a total of four V-grooved guide rollers 2 are attached, one on top and one on the bottom. As is clear from FIG. 2, the V-grooved guide roller 2 is rotatably attached to the eccentric roller shaft 2a. The axis of the eccentric roller shaft 2a is eccentric with respect to the center of rotation of the V-grooved guide roller 2. The eccentric roller shaft 2a is fastened and fixed to the first frame member 1 with a fixing bolt 2b. Therefore, the position of the V-grooved guide roller 2 can be finely adjusted by rotating the eccentric roller shaft 2a.

In FIG. 2, reference numeral 3 is a second frame member, which is a guide rail with a rack 10 and a guide rail 11.
However, they are integrally attached by the attachment screws 12.

A guide rail 10a having an inverted V-shaped cross section is formed on one side in the longitudinal direction of the guide rail 10 with a rack, and a rack 10b is formed on the opposite side. Two guide rollers 2 with V-grooves are in rolling contact with the guide rail 10a. On the other hand, the guide rail 11 also has an inverted V-shaped cross section, and another two V-grooved guide rollers 2 are provided.
Are to be transferred.

A pinion 5 is engaged with the rack 10b of the guide rail 10 with the rack, and
It is adapted to be rotationally driven by an appropriate rotational driving means.

Of the four guide rollers 2, the two guide rollers 2 guiding the rack-equipped guide rail 10 integrated with the rack 10b with which the pinion 5 meshes are finely moved by the eccentric roller shaft 2a. The guide roller 2 is fixed after adjusting the backlash between the pinion 5 and the rack 10b. Then the other 2
The individual guide rollers 2 are finely adjusted to accurately guide the other guide rails 10.

Since the apparatus of this embodiment is constructed as described above, when the pinion 5 is rotationally driven while the first frame member 1 is fixed, the rack 10b meshing with the pinion 5 will be described. The guide rail 10 with the rack moves in the longitudinal direction via the.

The rack guide rail 10 is guided by the upper two guide rollers 2, and the guide rail 11 integrated with the rack guide rail 10 via the second frame member 3 is on the lower side. Since it is guided by the two guide rollers 2 of
With the movement of 0, the second frame member 3 linearly moves.

In the above embodiment, the second frame member 3 is linearly moved while the first frame member 1 is fixed, but conversely, the second frame member 3 is fixed and the first frame member 1 is fixed. May be moved linearly.

FIG. 3 shows another embodiment of the present invention.
On the back side of the first frame member 1, two guide rollers 13 each on the left and right, a total of four, are attached to guide the rack-equipped guide rails 14 and the guide rails 15. The rack guide rails 14 and 15 are integrally attached to the third frame member 16 (a member similar to the second frame member 3).

Rack 1 of the guide rail 14 with the rack
Another pinion 17 is engaged with 4a. The pinion 17 is rotationally driven by a rotary drive device 18 and moves the third frame member 16 in the vertical direction via the rack 14a. Therefore, when the first frame member 1 is fixed, the second frame member 3 moves in the left-right direction,
Since the frame member 16 moves in the vertical direction, the second frame member 3 and the third frame member 16 relatively move in the directions orthogonal to each other. It is also possible to fix the second frame member 3 or the third frame member 16, and in that case, the other two frame members move relative to each other in the directions orthogonal to each other.

[0019]

【The invention's effect】

1) A guide rail with a rack in which the guide rail and the rack are formed on both sides of one elongated member is adopted, and the guide roller rolling on the guide rail with the rack is finely adjusted by an eccentric roller shaft to form a pinion. Since it is configured to control the backlash with the rack, it is possible to obtain a highly reliable linear guide drive device with a simple structure by omitting the complicated mechanism for removing the backlash as in the prior art. 2) Since all the guide rollers are adjustably mounted by the same unified eccentric roller shaft, the number of parts can be reduced and the mistake in mounting can be prevented. Also,
Of the plurality of eccentric roller shafts, a specific eccentric roller shaft may be a fixed type, that is, a mounting shaft that does not perform fine adjustment.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a linear guide driving device of the present invention, in which a second frame member is omitted.

FIG. 2 is a sectional view taken along the line EE of FIG.

FIG. 3 is a front view showing an application example of the device of the present invention.

FIG. 4 is a front view of a conventional device.

5 is a cross-sectional view taken along the line of FIG.

FIG. 6 is a front view of another conventional device.

[Explanation of symbols]

 1 First Frame Member 1a Fitting Recess 2 Guide Roller with V Groove 2a Eccentric Roller Shaft 2b Fixing Bolt 3 Second Frame Member 4 Guide Rail 5 Pinion 6 Rack 7 Swing Arm 7a Spindle 8 Spring Pressing Mechanism 9 Pinion 10 With Rack Guide rail 10a Guide rail 10b Rack 11 Guide rail 12 Mounting screw 13 Guide roller 14 Guide rail with rack 15 Guide rail 16 Third frame member 17 Pinion 18 Rotation drive device

Claims (3)

[Claims] 1. A total of four guide rollers, at least two at the top and two at the bottom, are attached to the first frame member so that one of the two guide rollers is brought into rolling contact with the first guide rail and the other two guide rollers are provided. To a second guide rail, attach the first and second guide rails to the second frame member in parallel with each other, and integrally form a rack on the opposite side of the first guide rail, The rack is the first
A linear guide driving device characterized in that a pinion rotatably attached to a frame is meshed with the pinion to drive the pinion to linearly move the second frame member with respect to the first frame member. 2. The guide roller is attached to the first frame member via an eccentric roller shaft, and the eccentric roller shaft is rotated to finely adjust the rotation center position of the guide roller. The linear guide drive device according to claim 1, which is characterized in that. 3. The linear guide drive device according to claim 1, wherein a V groove is formed around the guide roller, and an inverted V-shaped cross section is formed on the rail so as to fit with the V groove.