US 9,811,043 B2
Image forming apparatus
Ryuuichi Mimbu, Kanagawa (JP); Yoshio Hattori, Kanagawa (JP); Haruyuki Honda, Kanagawa (JP); Toshihiko Shimokawa, Kanagawa (JP); and Yoshiki Yamaguchi, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Ryuuichi Mimbu, Kanagawa (JP); Yoshio Hattori, Kanagawa (JP); Haruyuki Honda, Kanagawa (JP); Toshihiko Shimokawa, Kanagawa (JP); and Yoshiki Yamaguchi, Kanagawa (JP)
Filed on Mar. 8, 2016, as Appl. No. 15/64,076.
Claims priority of application No. 2015-054004 (JP), filed on Mar. 17, 2015; and application No. 2015-056374 (JP), filed on Mar. 19, 2015.
Prior Publication US 2016/0274523 A1, Sep. 22, 2016
Int. Cl. G03G 15/00 (2006.01)
CPC G03G 15/6558 (2013.01) [G03G 15/6576 (2013.01); G03G 2215/00662 (2013.01); G03G 2215/0132 (2013.01); G03G 2215/2035 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image forming device configured to transfer a first image to a recording sheet;
a fixing device configured to feed the recording sheet to a fixing nip portion and fix the first image onto the recording sheet;
a branching device configured to switch between an ejection path to eject the recording sheet fed downstream of the fixing device, to outside the apparatus, and a reversing path for duplex printing; and
a back curl correction structure in a sheet feeding path between the fixing device and the branching device,
the back curl correction structure including:
a drive roller at a side where a back curl is generated on the recording sheet in the fixing nip portion;
a driven roller at a side where the recording sheet is heated;
an auxiliary nip portion between the drive roller and the driven roller, configured to press and feed the recording sheet auxiliarily;
a guide member, at a same side as the drive roller relative to the sheet feeding path, configured to guide the recording sheet; and
a guide moving device configured to move the guide member to a first position to press the recording sheet while the recording sheet is passing through the auxiliary nip portion and a second position separated from the recording sheet.