Patent ID: 7571908
Filing Date: 2009-08-11
Classification: B65H

Abstract:
1. An image forming apparatus in which a sheet with an image formed on one surface by an image forming unit is reversed and conveyed again to the image forming unit, comprising: a re-conveying path which reverses the sheet having the image formed on one surface by the image forming unit and guides the sheet again to the image forming unit; a skew correcting unit provided on the re-conveying path, having a reference surface to which a side edge of the sheet abuts, and a plurality of pairs of rotary members which diagonally convey the sheet and abut the sheet to the reference surface; a changing unit which reduces or cancels a contact pressure of one of the pairs of rotary members excluding another one of the pairs of rotary members; a holding member which holds the plurality of pairs of rotary members; and a moving unit which moves the holding member in a width direction which perpendicularly crosses the sheet conveying direction according to a size of the sheet which is conveyed, wherein the changing unit is controlled to reduce or cancel the contact pressure according to a length of the conveyed sheet in a sheet conveying direction, wherein the changing unit reduces or cancels the contact pressure in an interlocking relational manner with the movement in the width direction of the holding member.