Abstract: Process and device for conveying objects on transport pallets along a circuit by altering the spacing (e, E) between the objects in order to pass through at least one work station (2, 3). The spacing is altered by longitudinally separating the pallets (4) in order to pass from a first interval, which can be non-existent, to a second interval (X) which can be adjusted. For this purpose, a station (7) is provided which laterally transfers groups of pallets (29, 39, 31, 32) between two sections of parallel tracks (5, 6). The groups are transversally separated stepwise by a ram (17), the pallets of a group (30) are then separated by engaging elements (22, 23) and driven together by a comb mechanism (26). Application in manufacturing, assembly or processing plants using pallet conveying mechanism, especially for the manufacture of containers blow-moulded from preforms.