Transport device for stacking partial book blocks

A transport device stacks partial book blocks along a transport path formed of transfer paths, and includes: a first transfer path at a start of the transport device; a first separating element downstream of the first transfer path and upstream of a second transfer path; a second separating element downstream of the second transfer path and upstream of a processing machine that is operatively connected to the transport device; and a transition path which is arranged either upstream or downstream of the second separating element and within which a book block product that is to be introduced therein is transferable from a transport position where it is lying flat and into a transport position where it is guided standing up. At least one of the transfer paths is equipped with at least one sheet stack feed unit and/or at least one collator-feeder.