Patent ID: 9738479
Date: 2017-08-22
CPC Classifications: B65H,G03G

Claim:
1. An image forming apparatus comprising: an image forming unit configured to form an image on a sheet; a stacking portion on which the sheet, having the image formed on the sheet by the image forming unit, is to be stacked; a first roller rotatable in a forward rotation direction and in a reverse rotation direction; a second roller configured to discharge the sheet to the stacking portion by rotating with the first roller which is rotating in the forward rotation direction; a third roller configured to convey a sheet, having an image formed on a first side of the sheet by the image forming unit, to the image forming unit again to form an image on a second side of the sheet, opposite to the first side of the sheet, by rotating with the first roller which is rotating in the forward rotation direction after rotating in the reverse rotation direction; a regulation portion configured to be movable between a regulation position, where conveying of the sheet stacked on the stacking portion in a direction opposite to a discharge direction by the second roller is regulated, and an allowing position, where discharging of the sheet by the first roller and the second roller is allowed; a movement unit configured to move the regulation portion between the regulation position and the allowing position; and a switching portion configured to be movable between a first position where the sheet having the image formed on the sheet by the image forming unit is guided by the switching portion to a conveying portion formed by the first roller and the second roller and a second position where the sheet having the image formed on the sheet by the image forming unit is guided by the switching portion to a conveying portion formed by the first roller and the third roller, wherein the switching portion and the regulation portion are configured to rotate coaxially, wherein the movement unit positions the regulation portion at the allowing position in a state where the first roller is rotating in the forward rotation direction, and positions the regulation portion at the regulation position in a state where the first roller is rotating in the reverse rotation direction, wherein the regulation portion, positioned at the regulation position, blocks an exit of the conveying portion formed by the first roller and the second roller, and wherein, when the regulation portion is positioned at the regulation position, the second roller is positioned at a position that is the same position at which the second roller is positioned when the regulation portion is positioned at the allowing position.