Abstract: An image forming apparatus includes: an image forming apparatus main body; a fixing unit detachably attached to the image forming apparatus main body, the fixing unit including a unit-side connector that electrically connects with a main body-side connector of the image forming apparatus main body when the fixing unit is attached to the image forming apparatus main body to receive electric power from the image forming apparatus main body; a first fixing unit attachment detection portion that is disposed at a position different from a position of the main body-side connector of the image forming apparatus main body in a longitudinal direction of the fixing unit of the image forming apparatus main body; and a second fixing unit attachment detection portion that is provided at a position different from a position of the main body-side connector of the image forming apparatus main body and a position of the first fixing unit attachment detection portion in the longitudinal direction of the fixing unit of the imag

Abstract: An image forming apparatus for forming an image on a recording material, to which apparatus a process cartridge is detachably mountable, wherein said process cartridge includes a photosensitive drum unit and a developing unit, wherein said photosensitive drum unit includes a photosensitive drum, and said developing unit is rotatably engageable with said photosensitive drum unit and includes a developing roller for developing an electrostatic latent image formed on said photosensitive drum, and wherein said developing unit is movable between a contact position in which said developing roller is in contact to said photosensitive drum and a spaced position in which said developing roller is spaced from said photosensitive drum, said image forming apparatus including means for exposing said photosensitive drum with light through a transmission member to form the electrostatic latent image, wherein said exposure means is positioned below said process cartridge when said process cartridge is mounted to a main assem

Abstract: An image forming apparatus includes an endless belt for carrying an image or for conveying an image forming medium, a driving roller connecting across the endless belt and driving the endless belt, a driven roller connecting across the endless belt and being driven in correspondence to movement of the endless belt, an image former for forming an image to the endless belt or to a medium conveyed by the endless belt, a speed detector for detecting moving speed of the endless belt and a speed controller for controlling the moving speed of the endless belt based on a detection result from the speed detector. The speed detector generates one pulse per rotation of the driven roller being driven in correspondence to the endless belt.

Abstract: The present invention relates to an image forming apparatus comprising an endless belt for carrying an image or for conveying an image forming medium, a driving roller connecting across the endless belt and driving the endless belt, a driven roller connecting across the endless belt and being driven in correspondence to movement of the endless belt, an image forming means for forming an image to the endless belt or to a medium conveyed by the endless belt, a speed detection means for detecting moving speed of the endless belt and a speed control means for controlling the moving speed of the endless belt based on a detection result from the speed detection means. The speed detection means generates one pulse per rotation of the driven roller being driven in correspondence to the endless belt.