Image forming apparatus

An image forming apparatus, comprising:

• optical means for illuminating a document and for projecting an image corresponding to said document on a photoreceptor;
• image forming means for forming an electrostatic latent image on the photoreceptor based on said image projected by said optical means, for converting said electrostatic latent image into a toner image and for transferring said toner image to paper;
• paper delivery means including a fixing unit for fixing said toner image transferred to said paper, said paper delivery means being adapted to introduce paper inside of a main body of said apparatus and for discharging the paper from said main body through said image forming means;
• drive means for driving said image forming means and said paper delivery means;
• and
• electric components;
• wherein said main body is made of a resin which houses said optical means, said image forming means, said paper delivery means and said drive means, said main body being formed from separable upper and lower casings each made in a monocoque structure,
• one of said upper and lower casings having boss portions located proximate at least four corners of said casing,
• the other casing having concaves adapted to receive said boss portions,
• said upper casing being provided at an upper part thereof with document delivery means including a pair of delivery rollers for delivering a document along a top surface of said upper casing while said document is held by and between said pair of delivery rollers;
• wherein said upper and lower casings are relatively positioned with respect to each other in the front-to-back direction and the transverse direction by said boss portions and said concaves fitted thereto, and
• the main body of said apparatus is provided at the ends thereof with a pair of shaft members, said upper and lower casings being vertically positioned with respect to each other with said shaft members inserted into through-holes formed in both end surfaces of one of said upper and lower casings and with said shaft members directly or indirectly engaged with the other casing.

An image forming apparatus, comprising:

• optical means for illuminating a document and for projecting an image corresponding to said document on a photoreceptor;
• image forming means for forming an electrostatic latent image on the photoreceptor based on said image projected by said optical means, for converting said electrostatic latent image into a toner image and for transferring said toner image to paper;
• paper delivery means including a fixing unit for fixing said toner image transferred to said paper, said paper delivery means being adapted to introduce paper inside of a main body of said apparatus and for discharging the paper from said main body through said image forming means;
• drive means for driving said image forming means and said paper delivery means;
• and
• electric components;
• wherein said main body is made of a resin which houses said optical means, said image forming means, said paper delivery means and said drive means, said main body being formed from separable upper and lower casings each made in a monocoque structure,
• said upper casing being provided at an upper part thereof with document delivery means including a pair of delivery rollers for delivering a document along a top surface of said upper casing while said document is held by and between said pair of delivery rollers;
• wherein the document delivery means includes:
• roller means for delivering a document along the top surface of the main body of said apparatus, said roller means including upper roller means adapted to come in contact with the top surface of the document and lower roller means adapted to come in contact with the underside of the document;
• holding means for rotatably holding said upper roller means;
• and
• supporting means for supporting said holding means together with said upper roller means;
• said holding means and said supporting means being connected to said main body by stretchable connecting means such that at least said holding means is vertically movable together with said upper roller means according to the thickness of the document.