A device (1) for transporting planar elements along a given conveying path, which includes an endless transport member (10) that is movably guided over the entire length of the conveying path by a series of substantially adjacent guide members (20, 30), at least one movable guide member (30) being movably mounted separately from the static guide members (20) that are fixedly mounted, between a retracted position in which the movable guide member (30) is placed in direct alignment with the static guide members (20), and a deployed position in which the movable guide member (30) is spaced apart from the static guide members (20). Complementary guide members (40) are movably mounted to move between a reserve position, in which complementary guide members are spaced apart from the static guide members (20) and from the movable guide member (30) when the latter is in the retracted position, and a service position, in which the complementary guide members are continuously inserted between the static guide members (20) and the movable guide member (30) when the latter is in the deployed position.