| 摘要 |
A parallel-kinematical machine (1) which has at least three setting device (4.1, 4.2, 4.3) which can be lengthened and shortened individually in their longitudinal direction, wherein each setting device (4.1, 4.2, 4.3) is connected to a positioning head (11) via a first joint, wherein each setting device (4.1, 4.2, 4.3) is connected to a machine base (2) via a universal joint (3.1, 3.2, 3.3), and wherein the positioning head (11) is movable within a working area in response to manoeuvring of the setting devices (4.1, 4.2, 4.3), wherein at least two reinforcing beams (5.1, 5.2, 5.2.1, 5.2.2) are each connected to the positioning head (11) viaa respective beam rotation bearing (10.1, 10.2), wherein each of said beam rotation bearings (10.1, 10.2) has only one degree of freedom, and wherein each of said beam rotation bearings is provided with two angle indicators (5.1a, 5.1b, 5.2a, 5.2b) which are each connected to the beam rotation bearing (10.1, 10.2) so that the measuring points of two angle indicators (5.1a, 5.1b) will each be situated on a respective side of the first beam rotation bearing (10.1) and so that the measuring points of two angle indicators (5.2a, 5.2b) will each be situated on a respective side of the second beam rotation bearing (10.2) so that the angle indicators will firstly register an angle 1, 2, 3, 4 between the positioning head (11) and respective reinforcing beams (5.1, 5.2) and secondly register a first angular difference 1, where 1= 2- 1, between the measuring points of the two angle indicators (5.1a, 5.1b) of the first beam rotation bearing (10.1) and also a second angular difference 2, where 2= 4- 3, between the measuring points of two angle indicators (5.2a, 5.2b) of the second beam rotation bearing (10.2) such as to form an active measuring system (AMS), wherein in the case of a loaded machine each deviation in the value of the angles 1, 2, 3, 4, from a nominal angle value in the case ofa non-loaded machine is adapted to be corrected by manoeuvring the setting devices (4.1, 4.2, 4.3) to a changed working positioning of the positioning head (11). |
