Labelling machine

There is described a machine for applying labels on articles transferred by respective labelling units along a given path (P); each unit comprises a receiving member having a lateral wall, which is adapted to receive a relative label and extends along an axis (F) transversal to the path (P); a cam and tappet device axially displaces the receiving members between a lowered position and a raised position and comprises a cam device, which is adjustable between a first and a second configuration; in the first configuration, cam followers of the units move along a first track (R) of the cam device to displace the respective receiving members between the lowered and raised position during transfer of the respective units; in the second configuration, the cam followers move along a second track (Q) of the cam device to maintain the respective receiving members in the lowered position during movement of the units along their path (P).