Patent ID: 9523957
Filing Date: 2016-12-20
CPC Classification: B65H,G03G

Claim Text:
1. An image forming apparatus comprising: an image forming section configured to form an image on a sheet; a pair of rollers disposed on an upstream side of the image forming section in a sheet conveyance direction, the rollers being configured to convey the sheet; a displacement detection section configured to detect a lateral position of the sheet passing between the rollers; a displacement correction section configured to translate the rollers in a lateral direction of the sheet, and reset the lateral position of the sheet to a reference position; a translation amount determination section configured to determine a translation amount of the sheet during a displacement correction performed by the displacement correction section; and a control section configured to refer to a translation control table in which a required translation amount for resetting the sheet to the reference position and a translation command value for operating the displacement correction section to translate the sheet by the required translation amount are associated with each other, operate the displacement correction section in accordance with a translation command value corresponding to a detection result obtained by the displacement detection section, obtain at a predetermined timing a relationship between the translation command value and a translation amount of the sheet, and update the translation control table on the basis of the relationship, wherein when updating the translation control table, the control section determines whether a displacement of a sheet in a certain range is correctable by the update of the translation control table, and the control section updates the translation control table when the displacement of the sheet is correctable, but does not update the translation control table when the displacement of the sheet is not correctable.