Each roller is connected to a drive shaft via a textile belt, from roller to roller in a loop or at a tangent to all the rollers, so that the movement is produced by the sliding of the boxes over a bed of revolving rollers.
Cada rodillo se conecta a un eje motriz mediante una correa textil, de rodillo a rodillo en bucle o tangencial a todos los rodillos, de modo que el movimiento se produce al deslizarse las cajas sobre una cama de rodillos giratorios.