Patent ID: 8649902

Claim:
A transport medium driving device comprising: a transport unit that transports a sheet-shaped transport medium on which an image is formed by an image forming unit; a position detecting unit that detects the position of the sheet-shaped transport medium transported by the transport unit; a positional deviation acquiring unit that acquires a positional deviation between the position detected by the detecting unit and a predetermined target position at a predetermined time interval or at a predetermined positional interval; a correcting unit that corrects the positional deviation on the basis of a correction amount for correcting a positional displacement between the sheet-shaped transport medium and the image formed on the sheet-shaped transport medium; a control unit that controls a transport speed of the sheet-shaped transport medium by the transport unit on the basis of the positional deviation corrected by the correcting unit; and a determining unit that determines whether a correction operation of the correcting unit is converged on the basis of a variation in the positional deviation over time.