| 主权项 |
1. An image forming apparatus comprising:
a body; a transfer nip defined by a photosensitive body on which an electrostatic latent image is formed and a transfer roller used to transfer a visible image formed on the photosensitive body to a printing medium; a fusing nip defined by a heating member having a heating source and a press roller adapted to press the printing medium toward the heating member, wherein the transfer nip and the fusing nip are horizontally arranged so that the fusing nip is located lower than the transfer nip, and the fusing nip is provided to deliver the printing medium upward, and wherein a printing path, along which the printing medium is delivered, between the transfer nip and the fusing nip includes a guide unit having a downward slope to guide the printing medium immediately having passed through the transfer nip and an upward slope to guide the printing medium approaching the fusing nip; and two guide ribs that are each provided at only opposite sides of the lower surface of a housing of a developing unit to push the edges the of the printing medium to prevent the printing medium from coming into contact with the housing, wherein the two guide ribs are allowed only to come into contact with the edges of the printing medium where none of the visible image is transferred, wherein the image forming apparatus further comprising an intersection point where a common tangent of the transfer nip and a common tangent of the fusing nip meet, and wherein a length of a fusing nip tangent between the fusing nip and the intersection point is shorter than a length of a transfer nip tangent between the transfer nip and the intersection point, and the length of the transfer nip tangent and the length of the fusing nip tangent satisfy the following relation:
1.5≦L1/L2≦2.0 where, L1 is the length of the transfer nip tangent, and L2 is the length of the fusing nip tangent. |
