Patent ID: 7900911

Claim:
An image forming apparatus comprising a sheet feeder apparatus including a sheet storage portion, the sheet storage portion including a regulating member and a fixing portion, the regulating member being provided to be able to be moved in a width direction orthogonal to a sheet feeding direction, the regulating member regulating a position of a sheet in the width direction, the fixing portion fixing the regulating member to a position according to a size of the sheet, the sheet feeder apparatus feeding the sheet regulated by the regulating member, wherein the fixing portion includes: a plurality of rack gears which are provided on a surface opposite a surface abutting on the sheet of the regulating member, the rack gears extended in a moving direction of the regulating member; a plurality of relay gears which engage the plurality of rack gears respectively; a rotating shaft on which the plurality of relay gears are provided; and a lock mechanism which has a lock gear which is provided on the rotating shaft, a lock member which has a gear portion, the gear portion engaging the lock gear to fix the lock gear; and a one-way clutch which restricts relative rotation between the rotating shaft and the lock gear, and the lock mechanism regulates rotation of the rotating shaft when the regulating member is moved away from the regulated sheet, the lock mechanism permitting the rotation of the rotating shaft when the regulating member is moved in a direction in which the regulating member contacts the regulated sheet.