Transferring and inspecting unit of a group of elongated elements

Abstract

A transferring and inspection unit for transferring and inspecting a group of elongated elements that are rod-shaped for smoking articles that includes a forming pocket, having a longitudinal axis, which is provided with a hollow housing suitable for housing a group of elongated elements to be inspected; a transporting conveyor of the forming pocket which is configured to advance the pocket along an advancing path through a first inspection position; a first tridimensional inspecting optical assembly configured to perform in respective successive scanning instants a plurality of first tridimensional optical scans by projecting a first light blade over a first head face of the group, during advancing of the forming pocket through the first inspection position; a processing device configured to obtain, for each first tridimensional scan, a respective first scanning line associated with the respective scanning instant and to reconstruct a first tridimensional profile of the first head face on the basis of the plurality of the first scanning lines, positioned in respective first reference positions. The forming pocket includes a first front face that in turn includes a first shaped surface be the first optical assembly is configured to perform simultaneously with each first tridimensional scan of the first head face also a respective first tridimensional scan of the first shaped surface to obtain a respective further scanning line; the processing device is in addition configured to calculate the reference position of each first scanning line analyzing the respective further scanning line.