JPS6020830A - Rotating table drive device - Google Patents

Abstract

PURPOSE:To permit revolution with high accuracy by using a revolution driving system by steel belts and a feeding screw in substitution for gear system. CONSTITUTION:When a motor 18 is revolved in the direction of arrow, a nut 13 transfers in a-direction, and a slider 12 formed integrally with the nut 13 moves in slidable ways between linear guides 17 and 17 and transfers in a- direction, and also a rotary disc 6 is pulled by a steel belt 10 and revolved in a- direction. When the surface of the nut 13 is attached onto a bearing 15, the reserving switch of the motor 18 operates to revolve the motor 18 in the reverse direction, and the nut 13 is transferred in b-direction, and also the turntable 6 is revolved in b-direction, pulled by a steel belt 8, and the turntable continues revolution at equal speed until the nut 13 is attached onto the bearing 15 and the reversing switch of the motor 18 is operated. Thus, the turntable 6 is revolved with high accuracy within a prescribed revolution angle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotating table, and particularly to a rotating table driving device suitable for obtaining highly accurate rotation.

[Background of the invention]

As shown in FIGS. 1 and 2, the conventional rotary table 1 uses a worm gear 2 and a worm wheel gear rotor as its drive mechanism, but due to the processing accuracy and assembly accuracy of both gears, Due to the misalignment of the mesh, the rotary table 1 moves vertically and the rotational speed becomes uneven. This causes undulations and convexities on the surface of the workpiece processed by the rotary table 1, which particularly impairs the rotation accuracy. It had the disadvantage that it could not be used for mirror cutting as required.

[Purpose of the invention]

An object of the present invention is to provide a rotary table drive device with high rotation accuracy without using a conventional gear combination system.

[Summary of the invention]

In short, this invention makes highly accurate rotation possible by replacing the drive system using gears with a rotation drive system using a steel belt and a feed screw. [Embodiments of the invention] Hereinafter, this invention will be explained based on the drawings.

FIG. 6 is a perspective view showing a state in which a steel belt is wound around a rotating cylinder of a rotating table in an embodiment of the present invention, and FIG. 4 is a partially sectional plan view of an embodiment of the present invention. FIG. 5 is a sectional view taken along line AA in FIG. 4.

First, the configuration will be explained. Reference numeral 4 denotes a rotating cylinder pivotally mounted on a base 5, a rotating table 6 is integrally provided on the upper surface of the rotating cylinder, and one end of a steel belt 8 having a short rectangular length 7 is fixed on the side surface of the rotating cylinder 4. One end of the steel belt 10, which is fixed by a metal fitting 9 and inserted through the inside of the elongated member 7, is fixed by a metal fitting 11 at a position symmetrical to the metal fitting 9. The above-mentioned steel bell) 8 and 10 are the above-mentioned rotating cylinder 4
After being pressed against the sides of the slider 12 so as to be wound in opposite directions, the other ends are fastened to both ends of the slider 12, respectively. A nut 13 is fixed to the center of the slider 12, and the nut 1
The feed screw 14 that engages with the screw hole No. 3 is inserted into the slider 12.
are arranged side by side, and both ends thereof are rotatably held by bearings 15.15. Reference numeral 16 denotes a side base which is placed parallel to the feed screw 14 on the outside of the feed screw 14, and holds the bearings 15.15 at both ends thereof, and also supports the linear guides 17, 1 of the slider 12 above and below.
7, and a motor 18 is attached to the outer end of the bearing 15 at one end of the side base 16.

Next, the effect will be explained. In the state shown in FIG. 4, when the motor 18 rotates in the direction of the arrow shown in the figure, the nut 16 moves in the direction of the arrow a. Therefore, the slider 12, which is integrated with the nut 15, slides between the linear guides 17 and 17 and moves as shown by the arrow a.
In order to move in the direction, the rotating disc 6 is also attached to the steel belt 1o.
A bow is strung on and rotated in the direction of arrow a. And Natsu 1
3 comes into contact with the bearing 15, the reverse switch of the motor 15 (not shown) is activated, the motor 18 is reversed, and the nut 10 moves in the direction of the arrow, being pulled by the steel belt 8 and rotated. The table 6 also rotates in the direction indicated by the arrow, and continues to rotate at a constant speed until the nut 13 comes into contact with another bearing 15 and a reversal switch (not shown) of the motor 18 is activated.

In this way, the rotary table 6 rotates at a constant speed within a predetermined rotation angle.

In addition, in this invention, both ends of the rotary table 6 and the slider 12 are tightly connected by two steel bells 8 and 10 having rigidity in the direction of rotation, and the slider 12 is
Since the gap between the upper and lower linear guides 17 and 17 is on the order of microns, the slider 12 can slide.
There is no vertical movement of the rotating table B.

In the above explanation, a steel belt was used for convenience, but there is no restriction, and the same effect as described above can be obtained by using a wire. Also, the material is not limited to metal, but can also be made of carbon fiber or other materials. But that's fine. In general, any material in the form of a band or string with a small expansion/contraction ratio may be used.

〔Effect of the invention〕

As explained above, according to the present invention, a rotary table driving device p with high rotation accuracy can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional rotary table driving device;
FIG. 2 is a longitudinal cross-sectional view of FIG. 1, FIG. 3 is a perspective view showing a state in which a steel belt is wound around the rotary cylinder of a rotary table in an embodiment of the present invention, and FIG. FIG. 5, a partially sectional plan view of an embodiment of the invention, shows a sectional view taken along line AA in FIG. Explanation of symbols 1: Rotating table 2... Uono, Gearro...
・Worm wheel gear 4...Rotating cylinder 5...Base 6...Rotating lap 7...Length 8.10...Steel belt 9.11...Stopper 12.Slider 13...Nut 14...Feed screw 15...Bearing 16
...Side base 17...Linear guide 18...
Akio Takahashi, Patent Attorney for Motors Figure 1 5 U) Figure 2 η'5

Claims (1)

[Claims] Two belt-like bodies or string-like bodies with a small expansion/contraction rate are wound around the rotary cylinder of the rotary table in opposite directions with one end fixed, and the two belt-like bodies or string-like bodies are rotated as described above. Once crossed on the rotating cylinder, the other end is fixed at a distance to a slider provided very close to the rotating cylinder, and the slider is moved in the tangential direction of the rotation of the rotating table. A rotary table driving device characterized in that it enables.