A drive mechanism (10) for driving a first adjustment member (12) for adjusting the orientation of the blades (14) of a first turbomachine rectifier stage (16) and a second adjustment member (18) for adjusting the orientation of the blades (20) of a second turbomachine rectifier stage (22), which comprises a mechanism for simultaneously moving the two adjustment members (12, 18) in the turbomachine, characterised in that it comprises a single drive wheel (24) that simultaneously drives the first adjustment member (12) and the second adjustment member (18) and comprises two gear stages (26, 28) that are arranged between the drive wheel (24) and one or the other of the first adjustment member (12) and the second adjustment member (18) and that have different transmission ratios.
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