JPS58137534A - Driver for table - Google Patents

Abstract

PURPOSE:To keep a machining table from yawing, roller, etc., by engaging the machining table with a driving table, which is moved by a driving system, so that a compressed air film is provided between the tables. CONSTITUTION:A driving table 14 is moved by the rotation of a ball screw 19. A protruded member 15 is secured on the driving table 14 so that compressed air conducted through a hole 16 is ejected through the protruded member. A recessed member 13, which is loosely fitted with the protruded member 15, is secured on a machining table 12. When the driving table 14 is moved, the machining table 12 is also moved because the protruded member 15 and the recessed member 13 are engaged with each other in such a manner that a compressed air film is provided between the members. Since the compressed air film absorbs external forces except the moving force, such as a vibratory force caused in a driving systen, the machining table 12 does not yaw, roll and pitch. Therefore, accurate machining is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a table driving device that allows a linearly movable table to move linearly without causing yawing, rolling, or pitching.

[Description of prior art]

Conventionally, in machine tools for precision machining, for example, there are the following methods for linearly moving a processing table. ■ A method in which the rotation of a ball screw installed on the bed side directly drives the table via a nut fixed on the table side. ■ A pinion installed on the bed side meshes with a rack fixed on the table side to drive the pinion. A method of directly driving the table by driving it. ■A method in which a table mounted on a bed is connected with a rope, and a predetermined tension is applied to drive the table from side to side.

Method (2) has the disadvantage that the bending, deflection, and mounting errors of the screws (regular screws, ball screws) cause force to act on the table in a direction other than the table's movement direction, which adversely affects machining accuracy.

Method (2) generates force in the direction perpendicular to the direction of movement due to the meshing of the rack and pinion, which has a negative impact on machining accuracy.

Method (2) does not generate disturbances like screws, racks, and pinions, but it has the disadvantage that the rigidity of the drive system decreases because the rope stretches.

[Purpose of the invention]

An object of the present invention is to provide a table driving device configured to move a linearly movable table without causing yawing, rolling, or pitching.

[Explanation of Examples]

In FIGS. 1 and 2, 10 is a spatula 10 placed on the floor, and the top surface of the spatula 10 has a pair of sliding surfaces 10.
It forms a. A processing table 1 is placed on the swinging surface 10.
2 and a driving table 14 are mounted on the 0 table 12. That is, a concave member 13 is fixedly provided on one side of the table 12, and a convex member 15 that engages with the concave member 13 is fixedly provided on the side of the drive table 14 facing the table 12. The convex portion of the convex member 15 has a third
As shown in the figure, a large number of air holes 21 are perforated, and the convex member 15 and table 14 have slots 1 communicating with the air holes 21.
6 is bored and a slot 16 is connected to an external compressed air supply device (not shown) via a flexible vinyl pipe 17. Further, a ball screw 19 is provided on the output shaft of the motor 20 mounted on the bed 10, and a ball screw 19 is integrally rotated, and a pole nut 18 is fixed to the bottom of the table 14 to be screwed into the pole screw 19.

Therefore, compressed air is introduced from the compressed air supply device (not shown) through the hose 17 through the slot 16 and into the air hole 21, and the compressed air is ejected into the U-shaped joint between the convex member and the concave member. to form a compressed air film and the motor 2
0, the rotation of the pole screw 190 is changed into a linear motion by screwing the pole nut 18, and the table 14 is moved. Convex member and concave member 13
Since the U-shaped play portion formed by the two members engages with each other via the compressed air film, the table 12 can be driven by the moving force of the table 14.

Therefore, the compressed air film absorbs the external force of the blade moving in the linear direction due to vibration, bending, deflection, etc. generated in the drive system of the motor 20, ball screw 19, pole nut 18, etc. Since it has no effect, Table 12
High precision processing can be performed when processing the above workpiece.

It should be noted that the shapes of the convex member and the concave member will be explained because there are the following modes in addition to the present embodiment.

In the device shown in FIG. 4, a member 31 having a spherical surface as a convex portion is provided on the drive side table 14, a member 32 having a concave spherical surface is provided on the table 12 side, and the spherical surfaces of the member 31 and the member 32 are provided. Compressed air is supplied from the table 14 side through slots 34 communicating with radial air holes 33 provided on the spherical surface of the member 31.

Therefore, rolling, pitching, and
It has the characteristic of being able to flexibly respond to yawing. The one shown in FIG. 5 shows an example in which a convex member 41 and a concave member 42 are disposed in a horizontal plane with their arcuate surfaces interlocking with each other. This example is effective against yawing and pitching of the drive system.

〔effect〕

As described above, the present invention can move a linearly movable table without causing yawing, rolling, or pitching.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the apparatus of the present invention. FIG. 2 is a sectional view taken along the line ■-■ shown in FIG. Figure 3 shows the l shown in Figure 2.
ll-1[1 cross-sectional view showing the cross section. FIG. 4 is a plan view showing the second embodiment, and FIG. 5 is a plan view showing the third embodiment. 12: Processing table, 13: Concave member, l4: Driving table, 15: Convex member. Applicant: Toshiba Machine Co., Ltd.,” 74B! 1 75 figure

Claims (4)

[Claims] (1) A movable table that can be moved in a straight line and is mounted on a bed, a concave member fixed to one side of the movable table, a convex member that fits with the concave member, and the convex member. a linearly movable drive table having attached thereto; a plurality of air holes formed to supply compressed air to the joint portion of the convex member or the concave member; and compressed air for supplying compression to the air holes. What is claimed is: 1. A table driving device comprising a supply device, and configured to move the driving side table in a straight line so as to follow the movable table. (2) The table driving device according to claim 1, wherein the mating portion between the convex member and the concave member is formed by forming two planes facing each other. (3) The table driving device according to claim 1, wherein the mating portion between the convex member and the concave member is formed by forming arcuate surfaces facing each other. (4) The table driving device according to claim 1, wherein the recessed portion between the convex member and the concave member is formed by forming spherical opposing surfaces.