JPS6268209A - Vertical type moving table device - Google Patents

Abstract

PURPOSE:To perform the positioning of a moving table high accurately in a short time, by individually connecting the moving table and a counterweight with forwardly and reversely rotating feed threads constituted on the same axis. CONSTITUTION:Feed threads 13, 14 are provided on the same shaft and threaded in the reverse direction to each other. A device respectively mounts a weight 12 to the thread 14 and a table 11 to the thread 13. If the thread 13 is rotated by a motor 16, the thread 14 also rotates, and the device lifts the table 11 and the weight 12 respectively in an opposite direction. In this way, the device, obtaining the compensation for gravity of the moving table 11 and forming the threads 13, 14 into rigid construction, performs positioning of the table 11 high accurately further in a short time.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a vertical moving table device.

[Technical background of the invention and its problems]

When performing gravity compensation in a conventional vertical movable table device, as shown in FIG.
This is done by suspending it with a steel belt 45.

However, in this method, the movable table 11 that moves along the guide 43 is rapidly accelerated by the drive motor 17.

This has the disadvantage that highly accurate positioning cannot be performed in a short period of time after driving for a sudden stop. This will be explained in a simulated manner with reference to FIG. (A) Move table 11
When the steel belt 45 rapidly accelerates and rises, the steel belt 45 floats up from the roller 44, and then the counterweight 12 rises as shown in (B).
Since the moving table 11 is lowered, the moving table 11 is slightly pulled up due to this effect, and it becomes necessary to adjust the moving table 11 again, making it impossible to complete positioning in a short time.

[Purpose of the invention]

The present invention improves the above-mentioned drawbacks of the conventional device, and aims to provide a device that can perform highly accurate positioning in a short period of time even after sudden acceleration or sudden stop, and has a long service life.

[Summary of the invention]

The present invention is characterized in that a vertical moving table and a counterweight are connected to respective feed line screws for forward rotation and reverse rotation configured coaxially.

〔Effect of the invention〕

The present invention connects a moving table and a counterweight to feed screws for forward rotation and reverse rotation configured on the same axis, so that when the moving table is moved upward, the counterweight moves downward. When the counterweight is moved downward, the counterweight is moved upward to compensate for the gravity of the moving table, and since the connection is rigid, highly accurate and high-speed positioning is possible in a short time. In addition, there is no need to consider the long life due to repeated bending, which is the case when hanging with a rigid belt, and a long life is guaranteed.

Furthermore, since the movable table section and the counterweight section are arranged coaxially, the installation area of the apparatus can be small.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention.

The counterweight 12 is attached to a feed screw 14 whose feeding direction is opposite to that of the feed screw 13. Feed screw 13
．． 14 are connected and configured on the same axis and supported by a bearing 17. In this device, a moving table 1
The moving table 11 is moved by the drive motor 16 in order to raise the table 1.
When the feed screw 13 is rotated, the feed screw 14 on the coaxial counterweight 12 side rotates in the same direction as the feed screw 13. However, since the feed screw 14 is threaded in the opposite direction to the feed screw 13, the counterweight 12
try to lower it.

(When the drive motor 16 rotates the feed screw 13 of the movable table 11 in order to lower the movable table 11, the counterweight 12 tries to rise.) This compensates for the gravity of the movable table 11, and Since the screws 13 and 14 have a rigid structure, they operate reliably, making it possible to position the movable table 11 with high precision and in a short time, while ensuring a long service life.

[Other embodiments of the invention]

Although the feed screws for forward rotation and reverse rotation are configured on the same shaft, the same effect can be achieved even if the feed screws for forward rotation and reverse rotation are made into separate shafts and connected with the joint 15 as shown in Fig. 2. The effect of this can be obtained.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a first embodiment of the present invention, Fig. 2 is a block diagram showing another embodiment of the present invention, Fig. 3 is a block diagram showing a conventional example, and Fig. 4 is a conventional example. This is a mock diagram of 11...Moving table 12...Counter weights 13, 14...Feed screw 15...Joint

Claims (1)

[Claims] In a vertical moving table device that performs gravity compensation on a moving table that has a moving axis in the direction of gravity using a counterweight that has a considerable weight as the moving table, normal rotation is performed in which the moving table and counterweight are configured coaxially. , a vertical movable table device characterized by being individually connected to a reversing feed screw.