公开(公告)号：US10564568B2

公开(公告)日：2020-02-18

申请号：US16239896

申请日：2019-01-04

Applicant: HP Printing Korea Co., LTD.

Inventor： Won-chul Jung ,  Joon-hee Kim ,  Young-hwan Kim

IPC: G03G15/08 ,  G03G15/06 ,  G03G15/16 ,  G03G15/00 ,  G03G21/18

Abstract: Provided is a method of detecting release of a development nip of an image forming apparatus that includes a photoconductor and a developing roller to contact each other to form a development nip and to be away from each other to release the development nip. The method includes obtaining a reference load, after charging the photoconductor in a state in which the development nip is formed, by measuring a load of a transfer system including the photoconductor and a transfer roller, release the development nip and blocking light irradiated from an exposing unit to the photoconductor, obtaining a detected load by measuring a load of the transfer system after exposing the photoconductor, and determining whether the development nip is normally released based on the reference load and the detected load.