| 摘要 |
A rail survey unit (130) measures the relative profile of an elevator guide rail (132) at a series of equally spaced points along the rail (132). A first support bearing assembly (134) and second support bearing assembly (136) maintain a constant spacing between the rail and the unit at two points along its length, and the distance between the unit and the rail at a third point is measured by orthogonal position sensors (160,162). An encoder (164) measures the distance travelled along the rail, and measurements are taken at the equally spaced points. The distances between the bearing assemblies (134,136) and sensors (160,162) are integral multiples of the spacing of the equally spaced points. <IMAGE> |
