摘要 |
A first lifting stand is provided with a first support unit for supporting a first portion of an object to be positioned, and also with a first servo device for driving the first support unit in the vertical direction. A second lifting stand is provided with a second support unit for supporting a second portion of the object to be positioned, and also with a second servo device for driving the second support unit in the vertical direction. A third lifting stand is provided with a third support unit for supporting a third portion of the object to be positioned, and also with a third servo device for driving the third support unit in the vertical direction. A fourth lifting stand is provided with a fourth support unit for supporting a fourth portion of the object to be positioned, and also with a fourth servo device for driving the fourth support unit in the vertical direction. |