Development device, and process cartridge and image forming apparatus including same

摘要

A development device includes a development casing for containing two-component developer, a developer bearer, a developer regulator to adjust an amount of developer carried on the developer bearer, a first developer conveyance member to supply developer to the developer bearer, a second developer conveyance member to transport axially developer separated from the developer bearer, first and second conveyance channels divided by a partition, in which the first and second developer conveyance members are respectively provided, and a removable sheet member to cover the developer bearer in an area facing the developer regulator, the first and second conveyance channels, and the partition. A first end portion of the sheet member extends from the second conveyance channel outside the development casing through a through hole formed in the development casing, and a second end portion thereof is retained by a retainer at a position outside the developer regulator.

主权项

1. A development device to develop a latent image formed on a latent image bearer with two-component developer including toner and carrier, the development device comprising:
a development casing for containing developer; a developer bearer disposed facing the latent image bearer through an opening formed in the development casing; a developer regulator disposed facing the developer bearer; a first developer conveyance member disposed facing the developer bearer; a second developer conveyance member disposed facing the developer bearer; a partition disposed facing the developer bearer and dividing an interior of the development casing into first and second conveyance channels in which the first and second developer conveyance members are respectively provided, forming a developer circulation channel, the first and second conveyance channels both facing the developer bearer and extending in an axial direction of the developer bearer; a sheet member removably installable inside the development casing to cover a surface of the developer bearer in an area facing the developer regulator, the first and second conveyance channels, and the partition, the sheet member including a first end portion extending from a position facing the second conveyance channel outside the development casing through a through hole formed in the development casing and extending outside of the development casing, and a second end portion extending from a position facing the developer regulator, wherein the through hole is located in a side of the development casing other than where the opening is located; and a retainer to retain the second end portion of the sheet member at a position outside the developer regulator.