Cleaning unit, process cartridge and image forming apparatus

摘要

A cleaning unit for an image forming apparatus includes a frame; a cleaning blade; a first seal sealing between the frame and the blade, provided by injection molding into the frame adjacent to an axial end; and a second seal between the frame and the drum, provided opposing to the free end portion adjacent to the axial end portion, and the second seal having a L-like configuration with projection extending in a direction crossing with the axial direction outwardly beyond an end surface of the blade, wherein the first seal includes a base portion provided at a position inside of the end surface and extending in the crossing direction and an extension extending from the base portion in the axial direction, the extension having a free end portion compressed by the projection to seal between the projection and the frame.

主权项

1. A cleaning unit for an image forming apparatus, said cleaning unit comprising:
a frame; a cleaning blade having a cleaning blade end portion contacting a rotatable image bearing member for removing a developer from an image bearing member; said frame comprising a developer accommodating portion for accommodating the developer removed by said cleaning blade; a first sealing member sealing between said frame and said cleaning blade to prevent leakage of the developer from said developer accommodating portion, said first sealing member being provided by injection molding into said frame adjacent to an axial end portion of the image bearing member; and a second sealing member sealing between said frame and said image bearing member to prevent leakage of the developer from said developer accommodating portion, said second sealing member being provided at a position opposing said cleaning blade end portion and adjacent to the axial end portion of the image bearing member, and said second sealing member having an L-shaped configuration with a projected portion extending in a direction crossing with the axial direction outwardly beyond an end surface of said cleaning blade with respect to the axial direction, wherein said first sealing member includes a base portion provided at a position inside of the end surface with respect to the axial direction and extending in the crossing direction and an extension extending from said base portion in the axial direction, said extension having an extension end portion compressed by said projected portion to seal between said projected portion and said frame.