Patent ID: 7991306

Claim:
A sheet transport apparatus, comprising: a sheet transport unit that transports a sheet; a sheet detecting unit that detects the sheet transported by the sheet transport unit; a rotary member that contacts with the sheet being transported and is driven to rotate by the sheet transported by the sheet transport unit; and an actual position detecting unit that detects an actual position of the sheet when a predetermined time elapses after the sheet detecting unit detects the sheet based on a rotation amount of the rotary member rotated by the detected sheet; and a controller that controls a sheet transport speed of the sheet transport unit based on a difference between the actual position of the sheet detected by the actual position detecting unit and a predicted position calculated based on the sheet transport speed of the sheet transport unit and the predetermined time, wherein the controller controls the sheet transport unit so as to increase the sheet transport speed of the sheet transport unit when the actual position detected by the actual position detecting unit is upstream in a delivery direction of the predicted position, and so as to decrease the sheet transport speed of the sheet transport unit when the actual position detected by the actual position detecting unit is downstream in the delivery direction of the predicted position.