| 摘要 |
The invention relates to a positioning unit for a carriage (3) that is adjustable by way of a linear drive (1), and a base (16), wherein the linear drive (1), in particular spindle drive or linear motor, has an elongate part and a short part. According to the invention, provision is made for the positioning unit (10) to have at least two compensation rods (4a, 4b), wherein in each case two adjacent compensation rods (4a, 4b) are connected together at one end via a joint (6) and are connected at the in each case other end to the elongate part of the linear drive (1) via one of two joint arrangements (5a, 5b) that are arranged in each case at the end of the elongate part of the linear drive (1), wherein the compensation rods (4a, 4b) and the elongate part of the linear drive (1) are arranged in the form of a triangle and the angle between the compensation rods (4a, 4b) and the joint (6) is variable by a thermal change in length of the elongate part of the linear drive (1), and wherein the carriage (3) is connected to the joint (6) and the short part of the linear drive (1) is connected to the base (16), or the carriage (3) is connected to the short part of the linear drive (1) and the base (16) is connected to the joint (6). |
