Abstract: An image forming apparatus wherein an image formed on an image bearing member is transferred onto a transfer material includes a feeder for feeding the transfer material to an image transfer station wherein the image is transferred from the image bearing member onto the transfer material; a guiding member for guiding the transfer material fed from the feeder to the transfer station in a guiding direction; a guide support for supporting the guiding member for movement in the guiding direction and in a direction transverse with the guiding direction; and an image bearing member supporting member for supporting the image bearing member for movement between a first position wherein the image forming apparatus is operable and a second position which is different from the first position, the image bearing member supporting member having an engaging portion for engagement with a part of the guiding member to correctly position the guiding member when the image bearing member supporting member takes its first positio

Abstract: A laser beam printer, in which a laser beam outputted by a laser diode pulse-modulated and controlled is deviated to be swept by means of a polygon mirror and folded by a reflecting mirror, after having passed through an F.theta. lens including two single lenses, so that it traverses the space between the two single lenses and reaches a light sensitive drum in order to expose it thereto.

Abstract: In a heat roller fixing device in a printing apparatus, a pressure roller and a heat roller are arranged in opposition to each other, and a medium is passed between the rollers to fix an image formed thereon. The device includes a heat roller unit in which the heat roller is supported by a fixing frame, and a main frame having guide rails for the heat roller unit, and the heat roller unit can be inserted in and withdrawn from the main frame along the guide rails.