JPH0985555A - Clamp device of linearly guiding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent displacement from being generated caused by clamping when a moving body is fixed to a guide member, by providing projecting parts on the front surface facing the clamp surface on a clamp plate. SOLUTION: A clamp plate 20 is so arranged that a through hole may coincide with a clamp hole in attaching, and a clamp bolt 22 as a pressing means is inserted through the through hole and the clamp hole and fastened. Three projecting parts 20a are formed on the clamp plate 20, and one flat surface is specified by the three hemispherical projecting parts 20a. Therefore, even if the clamp plate 20 is not manufactured at high precision, namely, even if the error is included in the heights of the hemispherical projecting parts 20a, a moving body 14 is fixed to a guide member 12 through the clamp plate 20 in a state where the upper supporting surface 16a is reliably flush with the upper guide surface 14a and the lower supporting surface 18a is flush with the Lower guide surface 14b.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in machine tools and the like, a linear guide device has been used to guide and move a movable body such as a table or a tool rest along a predetermined axis. The linear guide device generally has a guide surface extending in the axial direction and a sliding surface provided on the movable body so as to come into contact with the guide surface. Further, the linear guide device is provided with a clamp mechanism for stopping and fixing the moving body at a desired position.

5 and 6 are schematic sectional views of a general guide device according to the prior art. In FIG. 5, the left side of the center line shows the state during unclamping, and the right side shows the state during clamping. The conventional linear guide device 50 shown in FIG. 5 includes a guide member 54 extending along a predetermined axis. A movable body 52 such as a table or a tool rest is engaged with the guide member 54. The moving body 52 may be the table, the tool rest, or the like, or may be a part thereof. The moving body 52 is provided with a clamp bolt 56 for fixing the moving body 52 at a desired position. The moving body 56 is guided in the axial direction by sliding the vertical sliding surface 52a thereof against the vertical guiding surface 54a of the guide member 54. Guide member 54 as well known
There is a gap of several μm to several tens of μm between the movable body 52 and the moving body 52 in order to seal the lubricating oil or the oil for static pressure.
Therefore, in order to fix the moving body 52, the clamp bolt 5
When 6 is tightened, the movable body floats upward as indicated by the arrow by pressing the clamp bolt 56, and the movable body is displaced in the vertical direction.

FIG. 6 shows another linear guide device 60 of the prior art.
Shows the clamped state of. The linear guide device 60 includes a guide member 64 extending along a predetermined axis, like the linear guide device 50 of FIG. The moving body 62 is engaged with the guide member 64. The moving body 66 is guided in the axial direction by sliding the vertical sliding surface 62a thereof against the vertical guiding surface 64a of the guide member 64. In the linear guide device 60 of FIG. 6, the clamp bolt 66 is provided perpendicular to the vertical sliding surface 62a and the vertical guide surface 64a. Therefore, when the clamp bolt 66 is tightened, the moving body 62 moves in the direction indicated by the arrow.

[0005]

Since precision of submicron is required for precision machining in recent years, movement of the movable body during clamping poses a problem in machining precision. In order to solve this problem, in order to clamp the moving body, a method such as driving by using a dedicated wedge made by using a technique such as scraping is used. Producing wedges with the required accuracy has the problems of large cost and time.

[0006] The present invention has a technical problem to solve the above-mentioned problems of the prior art, and provides a clamp mechanism for a linear guide device which does not cause displacement by a clamp when a moving body is fixed to a guide member. Is intended.

[0007]

According to the present invention, there is provided a moving member of a linear guide device having a guide member extending along a predetermined axis and a moving member movably provided along the guide member. In a clamping device for fixing the to a desired position along the guide member, a first clamp surface formed in the guide member in parallel with the axis and a second clamp surface formed in parallel with the first clamp surface. And a third clamp surface formed to be flush with the first clamp surface in the movable body, and formed to be flush with the second clamp surface. A pair of clamp plates disposed so as to bridge between the formed fourth clamp surface and the first and third clamp surfaces and between the second and fourth clamp surfaces, and Those who bring a pair of clamp plates close to each other And a pressing means for pressing the clamp plate on the surface of the clamp plate, the clamp plate having three projections on the surface facing the first to fourth clamp surfaces, and each of the pair of clamp plates includes: At least one of the three protrusions is on one of the first and second clamp surfaces and the third and fourth clamp surfaces, and the other protrusion is on the first and second clamp surfaces. The gist is a clamp device arranged so as to contact the other of the third and fourth clamp surfaces.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. Referring to FIGS. 1 and 2, the linear guide device 10 according to the first embodiment of the present invention includes a guide member 12 extending along a predetermined axis. Guide member 12
Has a guide groove formed in a generally inverted T shape. The guide groove has an upper guide surface 12a and a lower guide surface 12b. The guide member 12 is fixed to a fixed portion such as a column or bed of the machine tool.

A movable body 14 such as a table of a machine tool or a tool rest is engaged with a guide groove of the guide member 12. Moving body 14
May be a table, a tool rest, etc., or a part thereof. The moving body 14 has a sliding portion formed in a shape complementary to the guide groove of the guide member 12, and the sliding portion includes an upper sliding surface 14a and a lower sliding surface 14b. In the moving body 14, the upper sliding surface 14a is in contact with the upper guide surface 12a, and the lower sliding surface 14b is in contact with the lower guide surface 14b.
It slides linearly along the guide member 12.

The guide member 12 has an upper cutout 16 provided on an outer upper surface thereof and a lower cutout 18 provided on an outer lower surface thereof.
And The upper notch 16 is formed from the outer upper surface of the guide member 12 to the guide groove, and the lower notch 18 is formed from the outer lower surface of the guide member 12 to the guide groove. The upper notch 16 has an upper support surface 16a, and the lower notch 18 has a lower support surface 18a. Upper support surface 1
6a is formed so as to be flush with the upper sliding surface 14a of the moving body 14, and the lower support surface 18a is the lower sliding surface 14 of the moving body 14.
It is formed so as to be flush with b. The guide member 12 is formed with a clamp hole 12c penetrating from the upper support surface 16a to the lower support surface 18a.

The clamp device according to the present embodiment comprises a pair of clamp plates 20. A pair of clamp plates 20
One of the upper support surfaces 1 of the guide members 12 arranged flush with each other.
It is bridged from 6a to the upper guide surface 14a of the moving body 14. Similarly, the other of the pair of clamp plates 20 moves from the lower support surface 16b of the guide member 12 arranged flush with the movable body 14 to the movable body 14.
Is bridged over the lower guide surface 14b. Clamp plate 20
On one surface, three hemispherical protrusions 20a are provided at each vertex of an isosceles triangle or an equilateral triangle. The clamp plate 20 is disposed so that the surface on which the protrusion 20a is formed faces the upper support surface 16a and the upper guide surface 14a and the lower support surface 16b and the lower guide surface 14b which are arranged flush with each other. There is. The clamp plate 20 has a through hole. The clamp plate 20 is arranged so that the through hole coincides with the clamp hole 12c at the time of mounting, and the through hole and the clamp bolt 12c are provided with a clamp bolt 22 as a pressing means. Insertion,
It is concluded. By tightening the clamp bolt 22, the clamp plate 20 is pressed against the upper and lower guide surfaces and the upper and lower support surfaces, and the upper support surface 16a and the upper guide surface 14a and the lower support surface 16b and the lower guide surface 14b are kept flush with each other. While being held, the moving body 14 moves the guide member 12 through the clamp plate 20
Fixed to.

Particularly in the illustrated embodiment, the clamp plate 20
Since three points of protrusions 20a are formed on the surface, and one plane is defined by the three points of hemispherical protrusions 20a,
Even if the clamp plate 20 is not manufactured with high precision, that is, even if the height of the hemispherical protrusion 20a includes some error, the upper support surface 16a, the upper guide surface 14a, and the lower support surface 1
6b and the lower guide surface 14b can be securely fixed in a state of being flush with each other.

FIG. 3 shows another embodiment. In FIG. 3, similar components are given the same reference numbers. In the embodiment of FIG. 3, the linear guide device includes a guide member 12 and a moving body 14.
Other configurations and operations are substantially the same as those of the embodiment shown in FIGS. 1 and 2, except that a rolling member 24 made of spherical steel is provided between and.

In the embodiment shown in FIGS. 1 to 3, the upper support surface 16a formed on the guide member 12 constitutes a first clamp surface, and the lower support surface 18a constitutes a second clamp surface. The upper sliding surface 14a of 14 constitutes the third clamping surface, and the lower sliding surface 14b constitutes the fourth clamping surface. The first clamping surface is provided parallel to the longitudinal axis of the guide member 12, and the second clamping surface is the first clamping surface.
It is formed parallel to the clamp surface of. The third clamping surface is formed flush with the first clamping surface and the fourth clamping surface is flush with the second clamping surface.

FIG. 4 shows still another embodiment. In FIG. 4, the linear guide device 30 includes a guide member 34 extending along a predetermined axis. The guide member 34 has an upper guide surface 34a and a lower guide surface 34b. Mobile unit 32
Are provided so as to be movable along the guide member 34. The moving body 32 has an upper sliding surface that contacts the upper guiding surface 34a of the guide member 34 and a lower sliding surface that contacts the lower guiding surface 34b. The moving body 32 further has an upper notch 36 and a lower notch 38. Similar to the embodiment described with reference to FIGS. 1 and 2, the upper notch portion 36 is formed so that its upper support surface 36a is flush with the upper guide surface 34a of the guide member 34. Similarly, the lower notch portion 38 has its lower support surface 38.
The a is formed so as to be flush with the lower guide surface 34b of the guide member 34.

A clamp plate 40 is provided on the upper notch 36 and the lower notch 38 as in the embodiment described with reference to FIGS. The clamp plate 40 is formed similarly to the clamp plate 20. One of the three hemispherical projections 40a of the clamp plate 40 is connected to the upper and lower guide surfaces 34a, 34
b, and the other two points are the upper and lower support surfaces 36 of the moving body 32.
a, 38a. After that, it is fastened and fixed by a clamp bolt 42 as a pressing means.

In the embodiment shown in FIG. 4, the upper guide surface 34a formed on the guide member 34 constitutes the first clamp surface and the lower guide surface 34b constitutes the second clamp surface, and the upper part of the movable body 32 is formed. The supporting surface 36a constitutes a third clamping surface and the lower supporting surface 38a constitutes a fourth clamping surface. First
Is provided parallel to the longitudinal axis of the guide member 12, and the second clamp surface is formed parallel to the first clamp surface. The third clamping surface is formed flush with the first clamping surface and the fourth clamping surface is flush with the second clamping surface.

Further, in the embodiment of FIGS. 1 to 3, the clamp plate has two points out of three protrusions on the first and second clamp surfaces and one point on the third and fourth clamp surfaces. Are arranged in contact with each other, and in the embodiment of FIG. 4, two points are arranged in contact with the third and fourth clamping surfaces, and one point is arranged in contact with the first and second clamping surfaces. That is, two of the three protrusions are on one of the first and second clamp surfaces and the third and fourth clamp surfaces, and the other one is on the first and second clamp surfaces.
If it is arranged on the other clamping surface and the other of the third and fourth clamping surfaces, the moving body can be fixed without displacement.

Further, in the illustrated embodiment, the notch is provided, but the notch is provided to form the first and third clamp surfaces and the second and fourth clamp surfaces flush with each other. In the present invention, it is essential that the above-mentioned clamping surface is flush, but the notch is not an essential element. It is also possible to provide overhanging portions (not shown) at both ends in the longitudinal direction of the moving body to provide a clamp surface that is flush with the clamp surface of the guide member.

Further, in the above-mentioned embodiment, the guide surface of the guide member and the sliding surface of the moving body which comes in contact with the guide member are used as the clamp surface. However, the clamp surface is provided separately from the guide surface and the sliding surface. It can also be formed.

Further, although the clamp bolt has been described as an example of the pressing means for tightening the clamp plates in the direction approaching each other, the present invention is not limited to this, and fluid pressure such as hydraulic pressure,
A mechanism utilizing a spring or lever principle may be used. Further, another member may be interposed between the clamp bolt and the clamp plate.

[0022]

As is apparent from the description of the above-described embodiments, according to the present invention, when the moving body is fixed to the guide member in the linear guide device, the moving body is not displaced with respect to the guide member. A clamping device is provided.

[Brief description of drawings]

FIG. 1 is a partial perspective view of one embodiment of the present invention.

FIG. 2 is a partial sectional view of FIG.

FIG. 3 is a partial cross-sectional view of another embodiment of the present invention.

FIG. 4 is a partial perspective view of another embodiment of the present invention.

FIG. 5 is a sectional view of a clamp device according to the prior art.

FIG. 6 is a sectional view of a clamp device according to the prior art.

[Explanation of symbols]

 12 ... Moving body 14 ... Guide member 14a ... Upper guide surface (first clamp surface) 14b ... Lower guide surface (second clamp surface) 16a ... Upper support surface (third clamp surface) 18a ... Lower support surface ( Fourth clamp surface) 20 ... Clamp plate 20a ... Projection 22 ... Clamp bolt

Claims (1)

[Claims] 1. A linear guide device having a guide member extending along a predetermined axis, and a moving member movably provided along the guide member, the moving member being located at a desired position along the guide member. In the clamp device, the first clamp surface formed parallel to the axis of the guide member and the second clamp surface formed parallel to the first clamp surface. A third clamp surface formed in the movable body so as to be flush with the first clamp surface; and the second clamp surface.
No. 4 formed to be flush with the clamping surface of the
And a pair of clamp plates arranged so as to bridge between the first and third clamp faces and between the second and fourth clamp faces, and the pair of clamp plates. Pressing means in a direction in which they approach each other, the clamp plate has three projections on the surface facing the first to fourth clamp surfaces, and the pair of clamp plates is provided. Each has at least one of the three protrusions.
Point protrusions are on one of the first and second clamping surfaces and the third and fourth clamping surfaces, and other protrusions are the first and second clamping surfaces and the third and fourth clamping surfaces. A clamping device arranged so as to contact the other side of the.