Developer supplying device, developing roller, developing device, image forming apparatus and process cartridge

A developing roller, comprising:

• a developer supplying device configured to supply a developer, comprising:
• a developer holding unit configured to hold the developer;
• a developer transfer device configured to electrostatically transfer the developer from the developer holding unit;
• and
• a charging member having plural holes piercing therethrough, configured to abrasively charge the developer by contacting the developer with walls of the plural holes while the developer is electrostatically transferred through the plural holes by the developer transfer device;
• and
• one of a development layer and a sleeve located overlying the charging member, configured to receive the developer electrostatically transferred through the charging member.

A developing device, comprising:

• a developing roller;
• a developer supplying device configured to supply a developer, comprising:
• a developer holding unit configured to hold the developer;
• a developer transfer device configured to electrostatically transfer the developer from the developer holding unit;
• and
• a charging member having plural holes piercing therethrough, configured to abrasively charge the developer by contacting the developer with walls of the plural holes while the developer is electrostatically transferred through the plural holes by the developer transfer device;
• and
• a layer thickness regulating member configured to regulate a thickness of a developer layer on the developing roller.

An image forming apparatus, comprising:

• an image bearing member configured to bear a latent electrostatic image thereon;
• a charging member configured to charge the image bearing member;
• an irradiator configured to irradiate the image bearing member to form the latent electrostatic image on the image bearing member;
• a developing device configured to develop the latent electrostatic image with a developer, comprising:
• a developing roller;
• a developer supplying device configured to supply a developer, comprising:
• a developer holding unit configured to hold the developer;
• a developer transfer device configured to electrostatically transfer the developer from the developer holding unit;
• and
• a charging member having plural holes piercing therethrough, configured to abrasively charge the developer by contacting the developer with walls of the plural holes while the developer is electrostatically transferred through the plural holes by the developer transfer device;
• a layer thickness regulating member configured to regulate a thickness of a developer layer on the developing roller;
• a transfer device configured to transfer the developed image to a recording material;
• and
• a cleaning device configured to remove residual toner on the image bearing member.

A process cartridge, comprising:

• an image bearing member configured to bear a latent electrostatic image thereon;
• and
• a developing device configured to develop the latent electrostatic image borne on the image bearing member, comprising:
• a developing roller;
• a developer supplying device configured to supply a developer, comprising:
• a developer holding unit configured to hold the developer;
• a developer transfer device configured to electrostatically transfer the developer from the developer holding unit;
• and
• a charging member having plural holes piercing therethrough, configured to abrasively charge the developer by contacting the developer with walls of the plural holes while the developer is electrostatically transferred through the plural holes by the developer transfer device;
• and
• a layer thickness regulating member configured to regulate a thickness of a developer layer on the developing roller.

A developer supplying device, comprising:

• means for holding a developer;
• means for electrostatically transferring the developer from the developer means for holding;
• and
• means for charging having plural holes piercing therethrough from the means for holding, for abrasively charging the developer by contacting the developer with walls of the plural holes while the developer is electrostatically transferred through the plural holes by the means for electrostatically transferring.