JPS59214526A - Sliding table - Google Patents

Abstract

PURPOSE:To simplify a device in structure and make it advantageous from the standpoint of assembling, by using a fixed base and part of a sliding base as part of a rolling bearing for rectilinear motion in combination. CONSTITUTION:A sliding base 20 has two pairs of ball rolling feed grooes 21 at both sides outward a structure body and a circulating hole 22 in addition. A driving part 25 moving the sliding base 20 is constituted of a motor 26 and a ball screw 27. A fixed base 30 also has a ball rolling feed grooves 31 being paired with these ball rolling feed grooves 21 at both sides inward the structure body and supports the driving part 25. Balls as a circulating type rolling bearing for rectilinear motion are inserted into space between these rolling feed grooves 21 and 31. Turning motion in the motor 26 is converted into rectilinear motion by the ball screw 27 at the driving part 25, and this rectilinear motion is transmitted to the sliding base 20 as it is. These balls roll on these rolling feed grooves 31 and 21, then pass through the circulating hole 22, thus balls are circulated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a moving table for moving an object to an arbitrary position on a plane at high speed and positioning it with high precision.

Structure of the conventional example and its problems In the conventional moving table, as shown in FIG. 1, the linear motion rolling bearing section 3 is combined with the bearing track 1 to form a unit. There is. That is, the bearing track 1 has two or more ball transfer grooves 2 on both sides, and the balls are circulated between the transfer groove 2 and the transfer groove 4 of the paired linear motion rolling bearing 3. It is structured as an integrated unit. The movement table is constructed by arranging these units in two child rows.

That is, the linear motion rolling bearing 3 is attached to the movable base 5 with bolts, and the bearing track 1 is attached to the fixed base 6 with bolts.
A driving section 7 was disposed between them, and the driving section 7 linearly moved the movable base 5 in a uniaxial direction. In such a configuration, when attaching the bearing track 1 combined with the two silk linear motion rolling bearings 3 to the fixed base 6 with bolts, the mutual parallelism of the two sets of linear motion rolling bearings 3 must be adjusted to a high degree. It is necessary to achieve high precision by assembling and adjusting the parts. Further, in order to achieve mutual parallelism of the 2,1i11 linear motion rolling bearings 3, even if processing was performed to provide a positioning guide during processing, highly accurate processing was required. In addition, the bearing way 1 is combined with the linear motion rolling bearing 3 and machined with high precision, and in order to maintain that precision, the flatness of the fixed base 6 to which the bearing way 1 is attached with bolts is also highly accurate. This required a large number of man-hours for assembly and processing, and the manufacturing price was relatively high, making it difficult to develop a low-cost, high-precision moving table.

FIG. 2 shows a specific configuration of a moving table as another conventional example. The roller reciprocating linear motion bearing 17 consists of a pair of groove tracks 1. The cylindrical roller 13 is assembled into a unit between j and 12, and the cylindrical roller 13 performs a finite reciprocating motion along with the linear movement of one of the V-groove wayways 11 and 12, and moves. One V of each of the two pairs of roller reciprocating linear motion bearings 17 is mounted on the base 14.
The groove track bases 12 are arranged in parallel and attached with bolts, and the other V
The groove track 11 was attached to a fixed base 15 with bolts, and a drive section 16 was arranged between the fixed bases 150, and the drive section 16 caused the movable base 14 to move linearly in a uniaxial direction. In this configuration, due to the structure of the roller reciprocating linear motion bearing 17, the roller 13 is a reciprocating type and not a circulating structure, so when moving linearly in the -axial direction, the moving base 1 is always
4 overhangs the fixed base 16, the rigidity of the movable base 14 decreases, and there is a limit to the movement stroke. Furthermore, since the moving stroke cannot be made large compared to the length of the moving base 14, there is a drawback that the device becomes large.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks and provides a movable table that can simplify assembly and adjustment.

Structure of the Invention The present invention provides: - a movable base that is movable in the axial direction, a drive section that moves the movable base, a fixed base that supports the movable base and the drive section, and a movable base that is sandwiched between the movable base and the fixed base. It consists of a rolling bearing for linear motion that has ball transfer grooves on both sides of the part that circulates the balls, and a part of the fixed base and the movable base are also used as part of the rolling bearing for linear motion. This simplifies the overall construction and is advantageous for assembly.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 3 and 4, reference numeral 20 denotes a moving base having two pairs of ball transfer grooves 21 on both sides of the outer side of the structure and a circulation hole 22, and 26 a moving base 2 of a fan.
A drive unit 3o includes a motor 26 and a ball screw 27 for moving the drive unit 3o, and a fixed drive unit 3o that supports the drive unit 5 and has rolling grooves 31 that pair with the ball transfer grooves 21 of the movable base 20 on both sides of the structure in the inward direction. A base, 32 is a ball that is fitted between the transfer grooves 21 and 31 and used as a rolling bearing for circulating linear motion, 33 is a photosensor for detecting the position of the moving base 20, and 34 is a light shield for the photosensor 33 for detecting the position. The plates 40, 41, and 42 are covers.

Regarding the moving table configured as above.

The operation will be explained below. The drive unit 25 converts the rotational motion of the motor 26 into linear motion using the ball screw 27. The linear motion is directly transmitted to the moving base 2o. Rolling grooves 31 provided on the fixed base 30 and the movable base 20.
A ball 32 rolls through 21 and circulates through the circulation hole 22 of the movable base 20. The fixed base 3Q has a structure in which a track portion of a linear motion rolling bearing and a base portion supporting the drive unit 25 are integrated. The ball transfer grooves 31 on both sides of the fixed base 30 are machined simultaneously in relation to each other. As the movable base 20 moves, the light shielding plate 34 attached to the movable base 20 shields the position detection photosensor 33, and detects, for example, the origin position of the movable base 20 and the O/<-run of the movable base 20.

As described above, according to this embodiment, by using a portion of the fixed base 30 and the movable base 2o as a part of a circulating type linear motion rolling bearing, the overall structure can be simplified, and the upper sliding part of the assembly can be simplified. This eliminates the need for centering at all, simplifies assembly and adjustment, and allows production at low cost.

In this embodiment, there are two pairs of ball transfer grooves 21, but two or more pairs may be used. The movable base 20 has two pairs of ball transfer grooves 21 on both sides of the structure in the outward direction, but as shown in FIG. Two pairs of blocks 23 having grooves 21 may be provided. Further, in this embodiment, the transmission groove 31 was directly machined on the fixed base 30, but after making the part including the transfer groove 31 into a separate block 35 made of a different material, for example, and fixing it to the fixed base 3o, this separate block 35 may be provided with a transfer groove.

Further, in this embodiment, the position detection photosensor 33 is arranged in the space formed between the two transfer grooves 21 of the moving base 20, but it may be arranged outside the two transfer grooves 21.

Effects of the Invention As described above, the present invention provides ball transfer grooves on both sides of the portion sandwiched between the movable base and the fixed base, and inserts the ball between the transfer grooves to circulate the movable base and the fixed pace themselves. By configuring it as a rolling bearing for linear motion, the overall configuration can be simplified and extremely advantageous in terms of assembly and adjustment can be provided.

[Brief explanation of the drawing]

1 and 2 are perspective views showing a conventional moving table, FIG. 3 is a perspective view showing a moving table according to an embodiment of the present invention, FIG. 4 is a sectional view of the same moving table, and FIG. 6 is a perspective view showing a moving table according to an embodiment of the present invention. FIG. 7 is a perspective view showing a moving table in a second embodiment. 2o...Movement base, 22...Transfer surface, 2θ. 27... Drive means, 3o... Fixed base, 21° 31... Transfer groove, 32...
ball. Name of agent: Patent attorney Kyoto Nakao and one other person fi
s 113 3 Figure 3 Figure 4

Claims (2)

[Claims] (1) A fixed base that has at least one pair of linear parallel transfer grooves on the inner side of the structure that holds the ball, and a relative slider in the same direction as the transfer grooves with respect to the fixed base. a movable base that moves; and a drive means that is fixed relatively to the fixed base and drives the movable base, and corresponds to the transfer grooves ID and l on the movable base;
A groove that holds the ball in cooperation with the transfer groove is formed on the outer side of the structure, and a transfer surface that holds the ball in a circulatory manner is formed, and the fixed base, the movable base, and the ball are aligned in a straight line. A moving table configured with rolling bearings for motion. (2) The moving table according to claim 1, wherein the driving means is disposed in a space formed between two transfer grooves of the fixed base.