US 12,271,140 B2
Brush having a higher contact pressure with an image bearing member at an upstream end of the brush and image forming apparatus
Takayuki Kanazawa, Kanagawa (JP); Nobuo Oshima, Tokyo (JP); Takayoshi Kihara, Shizuoka (JP); Kuniaki Tamagaki, Kanagawa (JP); Shuhei Tokiwa, Tokyo (JP); and Taichi Sato, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 17, 2023, as Appl. No. 18/512,282.
Application 18/512,282 is a division of application No. 18/081,910, filed on Dec. 15, 2022, granted, now 11,860,566.
Claims priority of application No. 2021-204782 (JP), filed on Dec. 17, 2021; and application No. 2021-204783 (JP), filed on Dec. 17, 2021.
Prior Publication US 2024/0085846 A1, Mar. 14, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G03G 21/00 (2006.01); G03G 15/02 (2006.01); G03G 15/16 (2006.01); G03G 21/16 (2006.01)
CPC G03G 21/0064 (2013.01) [G03G 15/0225 (2013.01); G03G 15/168 (2013.01); G03G 21/0005 (2013.01); G03G 21/007 (2013.01); G03G 21/169 (2013.01); G03G 21/0035 (2013.01); G03G 2215/022 (2013.01); G03G 2221/0005 (2013.01); G03G 2221/0089 (2013.01); G03G 2221/1618 (2013.01); G03G 2221/1627 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a rotatable image bearing member;
a charging member forming a charging portion in contact with the image bearing member and configured to electrically charge a surface of the image bearing member in the charging portion;
a developing member configured to develop, with the toner, an electrostatic latent image formed on the surface of the image bearing member;
a transfer member configured to transfer a toner image, obtained by developing the electrostatic latent image by the developing member, from the image bearing member onto a toner image receiving member in a transfer portion; and
a brush provided so as to contact the surface of the image bearing member in a contact portion downstream of the transfer portion and upstream of the charging portion with respect to a rotational direction of the image bearing member, and configured to electrically charge the toner which is not transferred onto the toner image receiving member,
wherein the toner which is not transferred onto the toner image receiving member is collected by the developing member,
wherein with respect to the rotational direction, a contact pressure between the brush and the image bearing member at an upstream end of the brush in the contact portion is higher than a contact pressure between the brush and the image bearing member at a downstream end of the brush in the contact portion, and
wherein a density of the bristle material is 150 kF/inch2 or more.