Machine for moving receptacles in front of at least one inspection station, along a given direction, said machine comprising: - a lower frame supporting a front half-carriage and a back half-carriage extending along longitudinal extension planes parallel to each other, and to the displacement plane of the receptacles, the lower frame having at least two transverse sides, one of which has a passage compartment for the end of a receptacle input conveyor that cooperates with a return head on the input side installed on the frame, while the other transverse side has a passage compartment for the end of a receptacle output conveyor that cooperates with a return head on the output side installed on the frame and delimiting, with a return head on the input side, a volume interrupting the conveyance, each transverse side being provided with a linear guide system formed by linear guide rails installed parallel to each other along a direction transverse to the displacement plane of the receptacles, the half-carriages being installed at each end, and sliding on said linear guide system (2 1) and with each half-carriage comprising: • a motorised device driving at least one belt in rotation, the motorised drive device being located at a first end of the half-carriage, • at least one first return device for at least one belt, located at the second end of the half-carriage, • at least one first endless drive belt installed between the motorised drive device and the return device with one strand placed at a distance from the strand of the belt supported by the other half-carriage so as to delimit a receptacle gripping and displacement path between them, - and a displacement system moving one half-carriage away from or towards the other half-carriage, each half-carriage comprising a rigid bridge formed from a horizontal beam supported at an upstream end by an input side support arm and at a downstream end by an output side support arm, each support arm ( 28, 29) being provided with a sliding pad cooperating with a rail of the linear guide system and the system controlling movement of the half-carriage towards or away from the other half-carriage being located outside the conveyance interruption volume. - a lower frame supporting a front half-carriage and a back half-carriage extending along longitudinal extension planes parallel to each other, and to the displacement plane of the receptacles, the lower frame having at least two transverse sides, one of which has a passage compartment for the end of a receptacle input conveyor that cooperates with a return head on the input side installed on the frame, while the other transverse side has a passage compartment for the end of a receptacle output conveyor that cooperates with a return head on the output side installed on the frame and delimiting, with a return head on the input side, a volume interrupting the conveyance, each transverse side being provided with a linear guide system formed by linear guide rails installed parallel to each other along a direction transverse to the displacement plane of the receptacles, the half-carriages being installed at each end, and sliding on said linear guide system (2 1) and with each half-carriage comprising: • a motorised device driving at least one belt in rotation, the motorised drive device being located at a first end of the half-carriage, • at least one first return device for at least one belt, located at the second end of the half-carriage, • at least one first endless drive belt installed between the motorised drive device and the return device with one strand placed at a distance from the strand of the belt supported by the other half-carriage so as to delimit a receptacle gripping and displacement path between them, • a motorised device driving at least one belt in rotation, the motorised drive device being located at a first end of the half-carriage, • at least one first return device for at least one belt, located at the second end of the half-carriage, • at least one first endless drive belt installed between the motorised drive device and the return device with one strand placed at a distance from the strand of the belt supported by the other half-carriage so as to delimit a receptacle gripping and displacement path between them, - and a displacement system moving one half-carriage away from or towards the other half-carriage, each half-carriage comprising a rigid bridge formed from a horizontal beam supported at an upstream end by an input side support arm and at a downstream end by an output side support arm, each support arm ( 28, 29) being provided with a sliding pad cooperating with a rail of the linear guide system and the system controlling movement of the half-carriage towards or away from the other half-carriage being located outside the conveyance interruption volume.