Image forming apparatus which maintains a temperature of a charge roller
AssigneeRicoh Company, Ltd.
InventorsJunji Kurokawa, Kazuo Nojima, Masako Chiba, Toshio Nakahara
Life of this patent
Estimating the term…
Abstract
An electrophotographic image forming apparatus using a charge roller for uniformly charging the surface of a photoconductive element, or image carrier, during image formation, and a charging device having the charge roller. The charging efficiency is enhanced, and a uniform charge distribution is set up by the application of a DC voltage only. This suppresses the increase in the cost of an apparatus, the increase in power source cost, and the generation of a great amount of ozone. As a result, a charging member and a photoconductive element are prevented from being deteriorated while environmental pollution is eliminated.
Claims15
In a charging device for an image forming apparatus, a cleaning member is held in contact with a charge roller having an elastic layer formed of epichlorohydrin rubber, said charge roller being rotated before actual image formation.
An image forming apparatus comprising:
- a charge roller contacting a photoconductive drum, the charge roller having an elastic layer formed of epichlorohydrin rubber;
- a cleaning member held in contact with the charge roller, the charge roller being rotated in contact with the cleaning member before actual image formation to maintain a surface of the charge roller at a predetermined temperature.
An image forming apparatus comprising;
- a charge roller contacting a photoconductive drum, the charge roller having an elastic layer formed of epichlorohydrin rubber;
- a cleaning member held in contact with the charge roller, the charge roller being rotated in contact with the cleaning member before actual image formation to maintain a surface of the charge roller at a predetermined temperature;
- wherein the charge roller has a black surface.
An image forming apparatus comprising:
- a charge roller contacting a photoconductive drum, the charge roller having an elastic layer formed of epichlorohydrin rubber;
- a cleaning member held in contact with the charge roller;
- means for rotating the charge roller in contact with the cleaning member before actual image formation to maintain a surface of the charge roller at a predetermined temperature.
An image forming apparatus comprising:
- a charge roller contacting a photoconductive drum, the charge roller having an elastic layer formed of epichlorohydrin rubber:
- a cleaning member held in contact with the charge roller;
- means for rotating the charge roller in contact with the cleaning member before actual formation to maintain a surface of the charge roller at a predetermined temperature:
- wherein the charge roller has a black surface.
In a charging device for an image forming apparatus, a cleaning member is held in contact with a charge roller having a layer formed of epichlorohydrin rubber, said charge roller being rotated before actual image formation.
An image forming apparatus comprising:
- a charge roller contacting a photoconductive drum, the charge roller having a layer formed of epichlorohydrin rubber;
- and
- a cleaning member held in contact with the charge roller, the charge roller being rotated in contact with the cleaning member before actual image formation to maintain a surface of the charge roller at a predetermined temperature.
An image forming apparatus comprising:
- a charge roller contacting a photoconductive drum, the charge roller having a layer formed of epichlorohydrin rubber;
- and
- a cleaning member held in contact with the charge roller, the charge roller being rotated in contact with the cleaning member before actual image formation to maintain a surface of the charge roller at a predetermined temperature;
- wherein the charge roller has a black surface.
An image forming apparatus comprising:
- a charge roller contacting a photoconductive drum, the charge roller having a layer formed of epichlorohydrin rubber;
- a cleaning member held in contact with the charge roller;
- and
- means for rotating the charge roller in contact with the cleaning member before actual image formation to maintain a surface of the charge roller at a predetermined temperature.
An image forming apparatus comprising:
- a charge roller contacting a photoconductive drum, the charge roller having a layer formed of epichlorohydrin rubber;
- a cleaning member held in contact with the charge roller;
- and
- means for rotating the charge roller in contact with the cleaning member before actual formation to maintain a surface of the charge roller at a predetermined temperature;
- wherein the charge roller has a black surface.
Dependencies are inferred from the claim text.