US 12,219,106 B2
Image reading apparatus and image forming system
Tomohito Nakagawa, Chiba (JP); Yukihiro Soeta, Kanagawa (JP); and Teppei Nagata, Chiba (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 12, 2024, as Appl. No. 18/602,729.
Application 18/602,729 is a continuation of application No. 18/056,196, filed on Nov. 16, 2022, granted, now 11,956,391.
Claims priority of application No. 2021-190495 (JP), filed on Nov. 24, 2021.
Prior Publication US 2024/0223710 A1, Jul. 4, 2024
Int. Cl. H04N 1/00 (2006.01); H04N 1/12 (2006.01)
CPC H04N 1/0057 (2013.01) [H04N 1/121 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An image reading apparatus configured to read an image of a sheet conveyed from an image forming apparatus configured to form the image on the sheet, the image reading apparatus comprising:
a conveyance path through which the sheet is to be conveyed in a conveyance direction;
a first transparent member configured to be arranged on the conveyance path and to be opposed to a first surface of the sheet;
a first reading unit configured to read a first image on the first surface of the sheet through the first transparent member at a first reading position of the first reading unit;
a first opposing roller configured to be rotatable, to be opposed to the first transparent member at the first reading position of the first reading unit, and to be opposed to a second surface opposite to the first surface of the sheet;
a second transparent member configured to be arranged on the conveyance path and to be opposed to the second surface of the sheet;
a second reading unit configured to read a second image on the second surface of the sheet through the second transparent member at a second reading position of the second reading unit downstream of the first reading position in the conveyance direction;
a second opposing roller configured to be rotatable, to be opposed to the second transparent member at the second reading position of the second reading unit, and to be opposed to the first surface of the sheet; and
a controller configured to perform, in a case where the sheet has a first thickness, a first mode in which the first opposing roller rotates at a first circumferential speed, and to perform, in a case where the sheet has a second thickness thicker than the first thickness, a second mode in which the first opposing roller rotates at a second circumferential speed faster than the first circumferential speed.