US 11,835,905 B2
Image forming apparatus
Junichi Moteki, Chiba (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 7, 2022, as Appl. No. 17/981,517.
Claims priority of application No. 2021-184629 (JP), filed on Nov. 12, 2021.
Prior Publication US 2023/0152742 A1, May 18, 2023
Int. Cl. G03G 15/00 (2006.01)
CPC G03G 15/6573 (2013.01) [G03G 2215/00417 (2013.01); G03G 2215/00561 (2013.01); G03G 2215/00616 (2013.01); G03G 2215/00721 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a transfer portion configured to transfer a toner image onto a recording material;
a first rotary member configured to rotate and include a heat source;
a second rotary member configured to form a nip portion by being in contact with an outer peripheral surface of the first rotary member, and fix a toner image by applying heat and pressure while nipping and conveying a recording material together with the first rotary member;
a loop detection unit configured to detect that a recording material is looped between the nip portion and the transfer portion in a conveyance direction of the recording material, the loop detection unit including a first contact portion in contact with a back surface of the recording material to which a toner image has been transferred by the transfer portion where a surface of the recording material in contact with the first rotary member is referred to as a front surface and a surface of the recording material in contact with the second rotary member is referred to as the back surface when the recording material is nipped and conveyed by the nip portion; and
a residual sheet detection unit configured to detect that the recording material remains in the nip portion between the nip portion and the transfer portion in the conveyance direction, the residual sheet detection unit including a second contact portion that is configured to come into contact with the back surface of the recording material to which the toner image has been transferred in the transfer portion,
wherein the first contact portion and the second contact portion are configured to rotate on the same rotation shaft, and
the second contact portion is configured to come into contact with the back surface of the recording material on a downstream of the first contact portion in the conveyance direction.