| 摘要 |
This system maintains a test head in an unloaded state, in which the influence of the gravity does not exist. A positioner assembly(30), which has a cradle assembly to attach the test head, moves vertically and horizontally to the column(12). A counter weight assembly maintains the positioner assembly in a unloading state. The positioner assembly(30) and the vertical column(12) have more than three parallel vertical shafts. As the positioner assembly spread horizontally, the three shafts support the weight of the assembly, on which the test head is attached. Two of the shafts rotate freely about respective axes and one of two shafts does'nt move vertically to the assembly(30). |
