G03G2221/1693

Image forming apparatus
11487213 · 2022-11-01 · ·

An image forming apparatus comprises a spacing member provided on a rotation shaft of a charging roller, the spacing member configured to include an engaging portion that engages with a rotation member, and to be rotatable between a spaced position at which a spaced state in which a photosensitive drum and the charging roller are spaced apart is maintained, and a released position at which the spaced state is released and the photosensitive drum and the charging roller are caused to be in contact; and a cover portion provided on the rotation shaft of the charging roller, and configured to cover an end face of the spacing member so that a fitting portion of the charging roller and the spacing member is covered.

Image forming apparatus with corona charger cleaning
09766569 · 2017-09-19 · ·

An image forming apparatus includes a corona charger, first and second supporting members for supporting the corona charger on the respective sides of the corona charger with respect to the circumferential direction of a photosensitive member, and first and second urging portions for urging a shield of the corona charger in the first and second supporting members. The first urging portion and the second urging portion urge the shield at non-opposing positions relative to each other with respect to a longitudinal direction of the corona charger. The image forming apparatus enables suppression of charging non-uniformity due to vibration of the corona charger without impairing motion of a grid cleaning member.

IMAGE FORMING APPARATUS
20220121135 · 2022-04-21 ·

An image forming apparatus comprises a spacing member provided on a rotation shaft of the charging roller, the spacing member configured to include an engaging portion that engages with the rotation member, and to be rotatable between a spaced position at which a spaced state in which the photosensitive drum and the charging roller are spaced apart is maintained, and a released position at which the spaced state is released and the photosensitive drum and the charging roller are caused to be in contact; and a cover portion provided on the rotation shaft of the charging roller, and configured to cover an end face of the spacing member so that a fitting portion of the charging roller and the spacing member is covered.

CONDUCTIVE MEMBER, CHARGING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

A conductive member includes: a substrate; an elastic layer provided on the substrate; and a surface layer provided on the elastic layer, in which the surface layer contains a conductive agent and has a sea/island structure that consists of a sea portion containing a first resin and an island portion containing a second resin, and a distance R between the island portions and a radius r of the island portion in a cross-section of the surface layer satisfy the following Expression (1-1),


?0.20?R?2r?0.40.Expression (1-1):

Conductive member, charging device, process cartridge, and image forming apparatus having surface layer with sea/island structure

A conductive member includes: a substrate; an elastic layer provided on the substrate; and a surface layer provided on the elastic layer, in which the surface layer contains a conductive agent and has a sea/island structure that consists of a sea portion containing a first resin and an island portion containing a second resin, and a distance R between the island portions and a radius r of the island portion in a cross-section of the surface layer satisfy the following Expression (1-1),
?0.20?R?2r?0.40Expression (1-1).

CHARGER

A charger includes three or more odd-numbered wire electrodes that extend along an intersection direction intersecting a movement direction of a photosensitive body and being along a surface of the photosensitive body, and are arranged along the movement direction; a center counter electrode facing a center wire electrode that is arranged at a center in arrangement of the odd-numbered wire electrodes, and including a first portion and a second portion that are arranged in a region on a side opposite to the photosensitive body with respect to the center wire electrode, with a gap formed in the movement direction; end counter electrodes facing end wire electrodes that are arranged at both ends in the arrangement of the odd-numbered wire electrodes, and being positioned at both ends of the arrangement of the odd-numbered wire electrodes to sandwich the wire electrodes; and an air guide plate that directs a part of an airflow sent to a region surrounded by the center counter electrode and the two end counter electrodes toward the gap between the first portion and the second portion.