Paper inverting device

A paper inverting device for inverting a sheet of paper around an inversion axis by a predetermined inversion angle when the sheet is transferred from a first transport surface to a second transport surface,

• wherein a first transport device forming the first transport surface and a second transport device forming the second transport surface each comprise a plurality of transport belts moving on transport paths along a paper transport direction and a suction device for sucking the sheet on the transport belts through suction holes formed on the transport belts, a turn guide disposed in parallel with the inversion axis between the first transport device and the second transport device has curved inversion/transfer surfaces from inversion start points corresponding to the first transport surface to inversion end points corresponding to the second transport surface, and the suction device comprises a plurality of suction machines disposed along the paper transport direction and a suction force controller for individually controlling suction forces of the suction machines according to paper transport conditions.