Image forming apparatus having exposure unit moving mechanism

摘要

A cam member has each of a plurality of first exposure-side surfaces provided in association with a first contact part of each exposure units and each of a plurality of second exposure-side surfaces provided in association with each first contact part. Each first contact part confronts but separates from the corresponding first exposure-side surface when the corresponding exposure unit is disposed in an adjacent position where the exposure unit is capable of exposing the corresponding photosensitive drum. Each first contact part is in contact with the corresponding second exposure-side surface when the corresponding exposure unit is disposed in a retracted position positioned farther than the adjacent position from the photosensitive drum.

主权项

1. An image-forming apparatus comprising:
a main casing formed with a first opening and a second opening, the second opening being formed separately from the first opening; a photosensitive drum having a rotation axis extending in an axial direction and configured to rotate about the rotation axis; a moving member configured to move in a first direction from a mounted position in which the moving member is mounted in the main casing to a withdrawn position in which the moving member is withdrawn to an outside of the main casing, the first direction being perpendicular to the axial direction and parallel to a horizontal direction, the moving member being configured to support the photosensitive drum; a developing cartridge including a developing roller and configured to supply developer to the photosensitive drum; a first cover configured to pivotally move about a pivot shaft between a closed position covering the second opening and an open position exposing the second opening, the pivot shaft extending in the axial direction; a fixing device including a heating roller and a pressure roller; and a discharge roller configured to discharge a sheet of paper toward the first cover, wherein the developing cartridge is configured to be detachably mounted in the main casing through the second opening in a vertical direction, wherein the moving member is configured to move from the mounted position to the withdrawn position through the first opening while the developing cartridge remains mounted in the main casing, and wherein the discharge roller and the pressure roller define a first distance therebetween, the discharge roller and the pivot shaft defining a second distance therebetween, the first distance being greater than the second distance.