| 摘要 |
An apparatus (1) for positioning objects (2) relative to a substantially horizontal working surface (5) having a longitudinal extension (3) in the X-direction and a transversal extension (4) in the Y-direction; with the apparatus (1) for moving objects (2) being arranged at least in a Z-direction standing substantially perpendicular to the working surface (5) and comprising at least two toothed racks (8,8') which extend at an axial direction adjacent to each other in the Z-direction at an axial distance (6) and are provided for receiving an object (2) to be moved each; with said toothed racks (8,8') being provided with a movable arrangement over a Z-displacement path (9), such that they are in engagement with a pinion (10,10') of a Z-drive (11) which is each motively driven in an individual fashion and exerts a pressing force on the respective toothed rack (8,8'), with the toothed racks (8,8') comprising two Z-rails (15,15') which project laterally in the Y-direction and extend in the Z-direction and which are slidingly held in Z-guide means (16,16') of an associated cage (17,17') carrying the individual pinion (10,10'), with the toothed racks (8,8') being arranged together with the respectively associated cage (17,17') alternating adjacent to each other along an axis (7) extending in the Y-direction in such a way that the cages (17,17') are alternatingly situated in front of and behind the axis (7), and with the Z-rails (15,15') of the similarly oriented toothed racks (8,8') being each arranged on a line (18,18') which extends parallel to the axis (7) and between the same and the teeth (19,19') of the toothed racks (8,8'); with the axial distance (6) of the toothed racks (8,8') being variable in the Y-direction by means of Y-drives (20) and the toothed rack packet (23) being movable to a compact position with a minimal axial distance (6) which substantially corresponds to the grating distance (12) of wells (13) of a microplate (14). The apparatus in accordance with the invention is characterized in that at least every other toothed rack (8,8') comprises spacers (21,21',31,31',31'') fastened to or arranged on the same, which spacers-for defining the minimum axial distance in the compact position of the toothed rack packet (23)-are abutted by a rail (15',15, 30,30') extending in the Z-direction of each of the
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