公开(公告)号：US10409214B2

公开(公告)日：2019-09-10

申请号：US16017635

申请日：2018-06-25

Applicant: HP PRINTING KOREA CO., LTD.

Inventor： Sang-Hoon Lee ,  Joon-Hee Kim

IPC: G03G21/16 ,  G03G15/06 ,  G03G21/18 ,  G03G15/08

Abstract: A development cartridge detachable from a main body of an image forming apparatus includes a photosensitive unit including a photosensitive drum and a developing unit including a developing roller. The developing unit is coupled to the photosensitive unit such that the developing unit is movable to a development position where a development nip forms by contact between the developing roller and the photosensitive drum and movable to a release position where the development nip is released. The development cartridge further includes a pressurizing unit movable to a first position where the pressurizing unit applies an elastic force to the developing unit in a direction such that the developing unit is maintained in the development position, and movable to a second position where the pressurizing unit applies an elastic force to the developing unit in a direction such that the developing unit is maintained in the release position.