US 12,280,579 B2
Sheet processing apparatus and image forming system
Akira Kunieda, Tokyo (JP); Satoshi Kuno, Tokyo (JP); Hirofumi Horita, Kanagawa (JP); Koju Kawakami, Tokyo (JP); Yasunobu Kidoura, Kanagawa (JP); Ryohsuke Akaishi, Kanagawa (JP); and Yohsuke Haraguchi, Kanagawa (JP)
Assigned to Ricoh Company, LTD., Tokyo (JP)
Filed by Akira Kunieda, Tokyo (JP); Satoshi Kuno, Tokyo (JP); Hirofumi Horita, Kanagawa (JP); Koju Kawakami, Tokyo (JP); Yasunobu Kidoura, Kanagawa (JP); Ryohsuke Akaishi, Kanagawa (JP); and Yohsuke Haraguchi, Kanagawa (JP)
Filed on Feb. 14, 2023, as Appl. No. 18/168,689.
Claims priority of application No. 2022-021849 (JP), filed on Feb. 16, 2022; and application No. 2022-198480 (JP), filed on Dec. 13, 2022.
Prior Publication US 2023/0256726 A1, Aug. 17, 2023
Int. Cl. B32B 41/00 (2006.01); B32B 37/00 (2006.01); B32B 38/18 (2006.01); B65H 7/12 (2006.01)
CPC B32B 38/18 (2013.01) [B32B 37/0046 (2013.01); B32B 41/00 (2013.01); B65H 7/12 (2013.01); B32B 2041/04 (2013.01); B65H 2701/1313 (2013.01)] 11 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;
a sheet sensor disposed downstream from the multifeed sensor on the sheet conveyance passage in the sheet conveyance direction and configured to detect the sheet passing a position of the sheet sensor; and
circuitry configured to:
stop an operation of the sheet processing apparatus when the multifeed sensor has not detected multifeed of the sheet and the sheet sensor does not detect a trailing end of the sheet after a first set time set in advance in accordance with a size of the sheet in the sheet conveyance direction has elapsed from detection of a leading end of the sheet with the sheet sensor;
stop an operation of the sheet processing apparatus when the multifeed sensor has detected the multifeed of the sheet and the sheet sensor does not detect the trailing end of the sheet after a second set time longer than the first set time has elapsed from the detection of the leading end of the sheet with the sheet sensor; and
cause the sheet processing apparatus to convey the sheet toward the purge unit without stopping the operation of the sheet processing apparatus when the multifeed sensor has detected the multifeed of the sheet and the sheet sensor detects the trailing end of the sheet before the second set time elapses from the detection of the leading end of the sheet with the sheet sensor.