Transport medium driving device, transport medium driving method, program product, and image forming apparatus

A transport medium driving method comprising:

• detecting the position of a sheet-shaped transport medium which is transported by a transport unit and on which an image is formed by an image forming unit, by using a position detecting unit;
• acquiring a positional deviation between the position detected in the detecting of the position and a predetermined target position at a predetermined time interval or at a predetermined positional interval, by using a positional deviation acquiring unit;
• correcting 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, by using a correcting unit;
• and
• determining whether a correction operation in the correcting of the positional deviation is converged on the basis of a variation in the positional deviation over time, by using a determining unit.

A computer program product comprising a non-transitory computer-readable medium having computer-readable program codes embodied in the medium for transporting a sheet-shaped transport medium, the program codes when executed causing a computer to execute:

• detecting the position of a sheet-shaped transport medium which is transported by a transport unit and on which an image is formed by an image forming unit;
• acquiring a positional deviation between the position detected in the detecting of the position and a predetermined target position at a predetermined time interval or at a predetermined positional interval;
• correcting 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;
• and
• determining whether a correction operation in the correcting of the positional deviation is converged on the basis of a variation in the positional deviation over time.