US 12,286,326 B2
Sheet processing apparatus and image forming system
Ryohsuke Akaishi, Kanagawa (JP); Akira Kunieda, Tokyo (JP); Yohsuke Haraguchi, Kanagawa (JP); Hirofumi Horita, Kanagawa (JP); Satoshi Kuno, Tokyo (JP); Koju Kawakami, Tokyo (JP); and Yasunobu Kidoura, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Ryohsuke Akaishi, Kanagawa (JP); Akira Kunieda, Tokyo (JP); Yohsuke Haraguchi, Kanagawa (JP); Hirofumi Horita, Kanagawa (JP); Satoshi Kuno, Tokyo (JP); Koju Kawakami, Tokyo (JP); and Yasunobu Kidoura, Kanagawa (JP)
Filed on Feb. 14, 2023, as Appl. No. 18/168,684.
Claims priority of application No. 2022-021855 (JP), filed on Feb. 16, 2022; and application No. 2022-198459 (JP), filed on Dec. 13, 2022.
Prior Publication US 2023/0303352 A1, Sep. 28, 2023
Int. Cl. B65H 43/06 (2006.01); B32B 37/00 (2006.01); B65H 7/06 (2006.01); B65H 7/20 (2006.01); B65H 29/62 (2006.01)
CPC B65H 7/20 (2013.01) [B32B 37/0053 (2013.01); B65H 7/06 (2013.01); B65H 29/62 (2013.01); B65H 43/06 (2013.01); B32B 2037/0061 (2013.01); B65H 2301/4213 (2013.01); B65H 2511/524 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A sheet processing apparatus comprising:
a sheet feeder configured to feed a sheet toward a sheet conveyance passage;
a sheet processing device disposed downstream from the sheet feeder in a sheet conveyance direction in which the sheet is conveyed, the sheet processing device configured to perform a predetermined operation on the sheet conveyed in the sheet conveyance passage;
a sheet ejection device disposed downstream from the sheet processing device in the sheet conveyance direction, the sheet ejection device configured to stack the sheet when the predetermined operation has been performed on the sheet by the sheet processing device;
a purge unit disposed downstream from the sheet processing device in the sheet conveyance direction, the purge unit configured to stack the sheet when the predetermined operation has not been performed on the sheet by the sheet processing device;
a multifeed sensor disposed on the sheet conveyance passage and configured to detect whether the sheet and another sheet are multifed from the sheet feeder and a number of multifed sheets including the sheet;
circuitry configured to:
count a number of sheets stacked in the purge unit;
determine that the sheets stacked in the purge unit is full when a number of counted sheets reaches a predetermined number of sheets; and
convey the multifed sheets toward the purge unit and add the number of counted sheets according to the number of sheets, in response to detection of the multifed sheets by the multifeed sensor; and
a sheet sensor disposed downstream from the multifeed sensor in the sheet conveyance direction and configured to detect the sheet passing a position of the sheet sensor, wherein, when the sheet sensor detects that conveyance of the sheet is stopped, the circuitry is further configured to:
stop the sheet processing apparatus to stop the conveyance of the sheet; and
cancel the number of counted sheets according to the number of multifed sheets.