Image forming device provided with side walls having empty region

摘要

An image forming device includes a main casing and a photosensitive unit having photosensitive bodies arrayed in an array direction. The main casing includes a first side plate having a first primary portion extending in the array direction, and having a first positioning portion and a second positioning portion spaced away therefrom in the array direction. The photosensitive unit includes a second side plate supporting the photosensitive bodies and having a second primary portion extending in the array direction. The second side plate has a third positioning portion subjected to positioning relative to the first positioning portion and has a fourth positioning portion subjected to positioning relative to the second positioning portion. The first and third portions are overlapped with each other and the second and fourth positioning portions are overlapped with each other while the first primary portion and the second primary portion are spaced away from each other.

主权项

1. An image forming device comprising:
a main casing; a plurality of photosensitive bodies each defining a longitudinal direction, and arrayed with a space between neighboring photosensitive bodies in an array direction perpendicular to the longitudinal direction; a photosensitive unit movable relative to the main casing and including the plurality of photosensitive bodies; an exposure unit disposed in the main casing and confronting the photosensitive unit in a confronting direction perpendicular to the longitudinal direction and the array direction, the exposure unit being configured to expose the photosensitive bodies to light; wherein the main casing comprises a first side plate supporting the exposure unit and having a first primary portion extending in the array direction, the first side plate also having a first positioning portion and a second positioning portion spaced away from the first positioning portion in the array direction; wherein the photosensitive unit comprises a second side plate supporting the photosensitive bodies and having a second primary portion extending in the array direction, the second side plate also having a third positioning portion subjected to positioning relative to the first positioning portion, and a fourth positioning portion subjected to positioning relative to the second positioning portion, the first positioning portion and the third positioning portion being overlapped with each other at a first overlapped position and the second positioning portion and the fourth positioning portion being overlapped with each other at a second overlapped position, in the longitudinal direction while the first primary portion and the second primary portion being spaced away from each other, a distance between the second overlapped position and the exposure unit in the confronting direction being smaller than a distance between the first overlapped position and the exposure unit in the confronting direction.