JPH0613401Y2 - Single axis table feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a uniaxial table feed device which is an integrated combination of a ball screw and a linear guide device.

[Conventional technology]

An example of a conventional uniaxial table feed device in which a ball screw and a linear guide device are combined is shown in FIGS. 6 and 7. Two guide rails 2 are fixed in parallel to each other on a base 1 at intervals, and a moving table 4 is mounted on a plurality of sliders 3 spanning each guide rail 2. Further on the base 1
The ball screw shaft 5 is supported with both ends supported by bearings 6 and 7. The ball screw shaft 5 is screwed into a nut 8 attached to the lower surface of the moving table 4. The end of the ball screw shaft 5 on the bearing 7 side is connected to the output shaft of a motor 10 fixed to the base 1 via a bracket 9.

When the ball screw shaft 5 is rotationally driven by the motor 10 to move the nut 8 in the axial direction, the moving table 4 moves to the guide rail 2
It moves smoothly in the axial direction while being guided by.

[Problems to be solved by the device]

However, the above-mentioned conventional example has a problem that the base 1, the guide rail 2, the slider 3, and the moving table 4 are all thick and large, and the whole weight is heavy.

Further, when particularly precise linear movement is required, when foreign matter such as dust, welding powder, cutting oil, etc. adheres to the guide rail 2, the ball screw shaft 5, etc., the guide rail and the ball screw shaft 5
Since the smooth rolling of the rolling elements rolling in the groove is hindered and the accuracy is impaired, dust prevention becomes an important issue. Therefore, a dustproof device is installed, but the dustproof device becomes large,
In addition, it is difficult to cover the entire table feeding device including the base part, and it is difficult to obtain a complete dustproof effect.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a single-axis table feeding device which is lightweight, compact, and has a complete dustproof function.

[Means for Solving the Problems]

To achieve the above object, the present invention provides a first support block that supports one end of a ball screw shaft via a bearing, and a second support block that supports the other end of the ball screw shaft via a bearing. A pair of beam members having U-shaped cross-sections and having axially rolling element rolling grooves on opposing inner surfaces, and having end portions fixed to the first and second blocks and suspended between both blocks. Guide rail, a nut screwed on the ball screw shaft through a large number of balls, and having a circulation path for the balls inside, a nut protruding from the side surface of the nut and loosely fitted on the guide rail, A slider having a rolling element rolling groove facing the rolling groove on the outer surface and having a rolling element circulation path inside, and a plurality of rollers rotatably inserted in the rolling element rolling grooves of the guide rail and the slider. Rolling element and expandable hollow shape A first dustproof cover having end portions secured to the first support block and the nut, and a second dustproof cover having end portions secured to the second support block and the nut; And a sealed dustproof structure for moving the nut forward and backward along the guide rail in the axial direction as the ball screw shaft rotates.

The first and second dustproof covers may be bellows dustproof covers.

[Action]

A thin lightweight guide rail with a U-shaped cross-section and increased rigidity also functions as a beam, guides the nut screwed to the ball screw shaft, and supports the shaft end of the ball screw shaft. As a result, the whole is slender, very light and compact.

Further, since the entire device is enclosed and sealed by the hollow cover that expands and contracts with the movement of the slider, a complete dustproof function can be exhibited.

〔Example〕

1 to 5 show an embodiment of the present invention. One end of the ball screw shaft 11 is rotatably supported by a first support block 13 via a bearing 12. On the other hand, the other end of the ball screw shaft 11 is also supported by the second support block 15 via the bearing 14.

Both the support blocks 13 and 15 are formed in a rectangular shape. The second support block 15 is the small block 1
5A and the large block 15B are integrally formed.
The left and right sides of the first support block 13 and the second
A mounting portion 18 of a guide rail 17, which will be described later, is provided in a protruding manner on both side surfaces of the small block 15A of the support block 15.

The guide rail 17 is relatively thin and has a U-shaped cross section.
The opposing upper and lower inner surfaces have axial rolling element rolling grooves 16, respectively. Then, the rail ends are fitted with the inner side surfaces 19 of the both support blocks 13 and 15 so that the inner side surfaces 19 are fitted to the mounting portions 18 as shown in FIG. In this way, a pair of
It is suspended between the second support blocks 13 and 15 and also functions as a beam member.

A square nut 22 is screwed onto the ball screw shaft 11 which penetrates the shaft center of the frame body which is composed of the first and second support blocks 13 and 15 and the pair of guide rails 17 and 17.
The nut 22 is provided with a ball circulation path 23 through which balls (not shown) fitted in the spiral groove 11A of the ball screw shaft 11 circulate.
It is a well-known structure that has a cylinder inside and is smoothly movable straight in the axial direction through ball rolling circulating according to the rotation of the ball screw shaft 11.

The left and right side surfaces of the nut 22 are one member of a known linear guide means which is loosely fitted to the guide rail 17 and guided by rolling of a large number of balls 24 (or rollers) which are rolling elements. The slider 25 is fixed with screws 26.
The slider 25 of this embodiment is a relatively thin rectangular prism.
Rolling element rolling grooves 28 are formed on the upper and lower outer surfaces of the guide rail 1.
7 is formed so as to face the rolling element rolling groove 16. A rolling element circulation path 29 communicating with the axial end of the rolling element rolling groove 28 is formed inside. A large number of balls 24 fitted in the rolling grooves 16 and 28 of both rolling elements facing each other
Is rolling with the axial movement of the slider 25, and infinitely circulates through the ball circulation path 29.

On the lower surface of the nut 22, a base plate 31 having a length substantially the same as the axial length of the nut and wider than the nut width is integrally fixed by a screw 32. A movable table / dustproof cover mounting member 33 having the same axial length and a U-shape is fixed to the base plate 31 with a screw 34, and surrounds the side surface and the upper surface of the nut 22. One end of the dust cover is fixed to the axial end surface of the moving table and dust cover mounting member 33.

The dust-proof cover of this embodiment includes a first bellows 35 and a second bellows 36 each having an expandable / contractible rectangular tubular hollow shape. Mounting plates 37, 38 and 39, 40 are adhered to both ends of the bellows 35 and 36, respectively.

The mounting plate 37 at one end of the first bellows 35 is fixed to the end surface of the first support block 13 with a screw 41, and the mounting plate 38 at the other end is mounted to the end surface of the moving table / dust cover attachment member 33, and is screwed. It is fixed at 42.

Further, the mounting plate 39 at one end of the second bellows 36 is provided with a screw 43 on the end surface of the large block 15B of the second support block 15.
The attachment plate 40 at the other end is attached to the opposite end surface of the moving table and dustproof cover attachment member 33, and is fixed with a screw 44.

A drive motor 45 is fixed to the outer end surface of the large block 15B of the second support block 15 with a bolt 46, and its output shaft 45A is connected to an end of the ball screw shaft 11 via a coupling 47.

The large block 15B of the second support block 15 is provided with a bolt insertion hole 48 for attaching the uniaxial table feed device to a mounting base of a machine or the like on the upper surface thereof. In addition, a screw hole 49 for bolting the driven body is formed on the table surface 33A of the moving table / dust cover attachment member 33.
Are formed.

Next, the operation will be described.

The guide rail 17 is relatively thin and has a U-shaped cross section. Since the guide rail 17 is also used as a beam structure, the device is much lighter and slimmer than the conventional one.
Moreover, it has high rigidity.

In addition, the guide rail 17, the slider 25, and the nut 2
A member such as the ball screw shaft 11 to which 2 is screwed, which does not like to adhere to foreign matter, is enclosed and sealed by the first bellows 35 and the second bellows 36 that expand and contract as the slider 25 moves. It can exhibit the dustproof function.

When the drive motor 45 operates in the forward / reverse rotation in response to a command signal from a control device (not shown), the ball screw shaft 11 is driven in the forward / reverse rotation accordingly, and the nut 22 slides on the nut 25.
While being guided by the guide rail 17 via the, it smoothly moves back and forth in the axial direction. At this time, the ball fitted in the spiral groove 11A of the ball screw shaft 11 circulates through the ball circulation path 23 inside the nut 22 according to the rotation of the ball screw shaft 11.

Further, the balls 24 fitted into the rolling element rolling grooves 16 of the guide rail 17 and the ball rolling grooves 28 of the slider 25 facing the rolling rails 17 roll while rolling with the movement of the slider 25. Moves in the groove toward the end of the rolling element and circulates through the rolling element circulation path 29.

Thus, when the nut 22 advances and retracts in the axial direction, the first bellows 35 and the second bellows 36 alternately expand and contract to follow the movement of the nut 22.

In the above-mentioned embodiment, the bellows is used as the dustproof cover, but another type of expandable cover such as a telescopic cover may be used.

[Effect of device]

As described above, according to the present invention, in a uniaxial table feed device in which a ball screw shaft and a linear guide device are combined, the frame is configured by a frame that also serves as a beam member for the guide rail of the linear guide device. The surroundings are sealed with a flexible dustproof cover. Therefore, there is an effect that it is possible to provide a uniaxial table feeding device that is thin and sufficiently lightweight, is compact, and has a complete dustproof function.

[Brief description of drawings]

1 is a partially cutaway perspective view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an overall side view, and FIG.
The figure is a view taken along the line III-III in FIG. 3, FIG. 5 is a plan view, and FIG.
FIG. 7 is a plan view of a conventional single-axis table feeding device, and FIG. 7 is a side view. 11 is a ball screw shaft, 12 and 14 are bearings, 13 is a first support block, 15 is a second support block, 16 is a rolling element rolling groove (of a guide rail), 17 is a guide rail, and 22 is a (ball Nut (for screw), 23 for ball circulation path (for nut), 24 for rolling element (ball), 25 for slider, 28
Is a rolling element rolling groove (of the slider), 29 is a rolling element circulation path, 33 is a moving table and dustproof cover mounting member, and 35
Is a first dustproof cover (bellows), 36 is a second dustproof cover, and 45 is a drive motor.

Claims (2)

[Scope of utility model registration request] 1. A first support block that supports one end of a ball screw shaft via a bearing, and a second support block that supports the other end of the ball screw shaft via a bearing in a U-shaped cross section. And a pair of guide rails having an axial direction rolling element rolling groove on the inner surface thereof, the end portions of which are fixed to the first and second blocks and suspended between the blocks, A nut that is screwed onto a ball screw shaft through a large number of balls and has a circulation path for the balls inside, and a nut that projects from the side surface of the nut and is loosely fitted to the guide rail, and faces the rolling element rolling groove. A slider having rolling element rolling grooves on the outer surface and having a rolling element circulation path inside, and a large number of rolling elements that are rotatably inserted in the rolling element rolling grooves of the guide rail and the slider. Having a hollow shape, the first support A first dustproof cover having end portions fixed to the block and the nut, and a second dustproof cover having end portions fixed to the nut and the nut, respectively, and a rotation of the ball screw shaft. A uniaxial table feed device with a sealed dustproof structure that moves the nut forward and backward along the guide rail in the axial direction. 2. The uniaxial table feed device according to claim 1, wherein the first and second dustproof covers are bellows dustproof covers.