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US 8,913,915 B2Granted
Charging device
AssigneeCanon Kabushiki Kaisha
InventorYuichi Makino
Life of this patent
Estimating the term…
Abstract
A corona charger conventionally includes a sheet-like shutter and a holding member configured to hold an end of the shutter, and the replacement of a charging electrode is difficult. To solve this problem, the holding member configured to hold the end of the shutter is set to be movable along the longitudinal direction of a shield to a winding member of the shutter more than a supporting member configured to replaceably support the charging electrode.
Claims8
A charging device comprising:
- a housing including an opening opposed to a charged member;
- a discharge wire disposed in the housing;
- a shutter configured to open and close the opening;
- a cleaning member configured to clean the discharge wire;
- a moving mechanism configured to reciprocate the shutter and the cleaning member along a longitudinal direction of the opening, the moving mechanism including a drive member to be rotationally driven, a first moving member held by the drive member and configured to move the shutter with rotational drive of the drive member, and a second moving member held by the drive member and configured to move the cleaning member with the rotational drive of the drive member;
- a mechanism configured to form a gap between the shutter and the cleaning member so that the cleaning member is ahead of the shutter by a predetermined distance when the shutter is moved in a closing direction;
- and
- a stopper configured to stop a movement of the cleaning member,
- wherein the second moving member includes a holding unit to allow idle rotation with the drive member when the shutter is moved toward the cleaning member stopped by the stopper in the closing direction.
6 more elements
An image forming apparatus comprising:
- a photosensitive member;
- a charging device including a discharge wire, a housing with an opening surrounding the discharge wire and opposed to the photosensitive member, a shutter configured to open and close the opening, a cleaning member configured to clean the discharge wire, and a moving mechanism configured to reciprocate the shutter and the cleaning member along a longitudinal direction of the opening;
- a toner image forming device configured to form a toner image on a photosensitive member charged by the charging device;
- and
- an adjustment mechanism configured to adjust a gap between the shutter and the cleaning member,
- wherein the adjustment mechanism is configured to move the cleaning member ahead of the shutter when the shutter is moved in a closing direction so that the gap between an end of the shutter in a shutter closing direction and the cleaning member is reduced when the shutter is closed.
3 more elements
Dependencies are inferred from the claim text.