Abstract: An image forming apparatus includes an LED unit capable of being in an exposing position or a retracted position, and a cartridge capable of being inserted into or pulled out with the LED unit in the retracted position.

Abstract: An image forming apparatus includes an LED unit capable of being in an exposing position or a retracted position, and a cartridge capable of being inserted into or pulled out with the LED unit in the retracted position.

Abstract: When a stirring member that stirs developer in a developer containing portion rotates at high speed, toner flies and the detection accuracy of light transmission type toner remaining amount detection is degraded. A developing apparatus including a developer containing portion that contains developer, a stirring member that stirs the developer in the developer containing portion, and a partition member which is disposed to separate the developer containing portion from a space adjacent to the developer containing portion and which bends to block at least a part of a light path, which is formed in the space and used to detect an amount of the developer, when being pressed by the stirring member via the developer.

Abstract: A color electrophotographic image forming apparatus forms an image on a recording material. A plurality of cartridges is detachably mounted to a main assembly of the apparatus. The apparatus includes a cartridge supporting member for supporting the cartridges. The cartridge supporting member is movable between an inside position inside the main assembly and an outside position outside the main assembly. The apparatus also includes a shutter member movably provided on the cartridge supporting member. The shutter member is movable between an open position in which a photosensitive member supported by the cartridge supporting member is exposed and a closed position in which the photosensitive member is protected.

Abstract: A developing unit includes a developer storage unit, a developer bearing member, an agitation member, a flexible member, and a magnet member. The developer storage unit stores a developer. The developer bearing member develops an electrostatic latent image formed on an image bearing member with the developer. The agitation member agitates the developer in the developer storage unit. The flexible member, disposed in the developer storage unit, is distorted by pressure applied by the agitation member via the developer. The magnet member, disposed on the flexible member, is displaced in response to the flexible member being distorted.

Abstract: The image forming apparatus having LED unit capable of being in an exposing position or a retracted position, and a cartridge capable of being inserted into or pulled out along the LED unit in the retracted position.

Abstract: A color electrophotographic image forming apparatus forms an image on a recording material. A plurality of cartridges is detachably mounted to a main assembly of the apparatus. The apparatus includes a cartridge supporting member for supporting the cartridges. The cartridge supporting member is movable between an inside position inside the main assembly and an outside position outside the main assembly. The apparatus also includes a shutter member movably provided on the cartridge supporting member. The shutter member is movable between an open position in which a photosensitive member supported by the cartridge supporting member is exposed and a closed position in which the photosensitive member is protected.