Patent ID: 6267368
Filing Date: 2001-07-31
Classification: G03G

Abstract:
An image forming apparatus for forming images on a single side of paper or on both sides of paper, comprising:a main body having a paper feeding port through which paper passes into said main body and a paper output port through which paper passes out of said main body;an image forming unit arranged in said main body for forming an image on paper;a paper transport mechanism for transporting paper from said paper feeding port to said image forming unit;a paper ejector for ejecting the paper carrying the image formed by said image forming unit out of said main body through said paper output port;a device mounting portion arranged in said main body;a paper return device detachably connectable to said device mounting portion and having a paper return guideway connecting said paper output port to said paper feeding port when said paper return device is connected to said main body, said paper return device being arranged to feed a paper ejected out of said main body from said paper output port to said paper feeding port through said paper return guideway to thereby enable the formation of images on both sides of the paper;a paper tray detachably connectable to said device mounting portion and arranged relative to said paper feeding port to enable paper to be fed from said paper tray through said paper feeding port into said main body when said paper tray is connected to said main body, whereby said paper tray or said paper return device is selectively arranged in connection with said device mounting portion; andsaid paper return device including a paper tray arranged in alignment with said paper feeding port when said paper return device is connected to said device mounting portion and which enables paper to be feed therefrom through said paper feeding port into said main body, said paper tray of said paper return device being openable and closeable.