公开(公告)号：US20190369539A1

公开(公告)日：2019-12-05

申请号：US16478030

申请日：2018-01-18

Applicant: HP PRINTING KOREA CO., LTD.

Inventor： Sang Jin PARK ,  Sung Min PARK ,  Hyo Joong KIM ,  Jong Woo LEE ,  Mi Young KIM

IPC: G03G15/00

Abstract: An image forming apparatus capable of detecting a development nip disengaging error and a method of detecting a development nip disengaging error are provided. According to an example method, a test pattern is formed on a photoconductor of an image forming apparatus, the test pattern transferred to an intermediate transfer belt is detected through a sensor from a time when an operation of an adjusting member moving a developing roller is controlled such that the developing roller moves from a disengaging position where the developing roller is spaced from the photoconductor to disengage a development nip from the photoconductor to a developing position where the developing roller is in contact with the photoconductor to form the development nip, and whether the development nip disengaging error occurred is determined based on the detected test pattern.