An image forming apparatus includes a detachable unit including a driven member, and an apparatus body to which the detachable unit is detachably attached. The apparatus body includes a driving-force transmission portion including an engagement member, a support portion including an extending surface, a brake portion configured to generate brake force that applies load to rotation of the driven member, and a brake-force applying portion including a through member and a brake engagement member, the brake-force applying portion being configured to apply the brake force to the driven member via the through member and the brake engagement member by the brake engagement member engaging with the driven member. The brake portion is disposed opposite the driving-force transmission portion across the extending surface in the axis direction.

An image forming apparatus includes a driving source, a first driven member, a second driven member, a first driving-force transmission unit configured to transmit driving force output from the driving source to the first driven member, the first driving-force transmission unit including a clutch mechanism, and a second driving-force transmission unit configured to transmit the driving force to the second driven member, the second driving-force transmission unit including a brake portion. The second driving-force transmission unit is connected to the first driving-force transmission unit between the clutch mechanism and the first driven member. In a case where the clutch mechanism is in the transmission state, the first driven member is driven by both of a first torque transmitted via the first driving-force transmission unit, and a second torque transmitted via the brake portion of the second driving-force transmission unit.

An image forming apparatus includes a photoreceptor that has a surface layer in which a transmittance of light having a wavelength of 1,000 nm is 5% or more and 95% or less, a charging device that charges a surface of the photoreceptor, an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the photoreceptor, a developing device that develops the electrostatic latent image formed on the surface of the photoreceptor with a developer containing a toner to form a toner image, a transfer device that transfers the toner image to a surface of a recording medium, and a photoreceptor cleaning device that has a cleaning blade coming into contact with the surface of the photoreceptor to clean the surface of the photoreceptor, in which a contact portion of the cleaning blade coming into contact with the photoreceptor contains a polyurethane rubber that is obtained by polymerizing at least a polyol component and a polyisocyanate component, a ratio M100/Re of a 100% modulus M100 (MPa) to an impact resilience coefficient Re (%) is 0.25 or more, the impact resilience coefficient Re is less than 25%, and a tensile stress with a 200% strain at a temperature of 23 C. is 15 MPa or more.

Provided is an image forming apparatus that forms a toner image by developing an electrostatic latent image which is formed by charging and exposing an image bearing member, and transfers the toner image onto a transferred member. The image forming apparatus can perform developer collection to return a toner image on the image bearing member to developing unit. The image forming apparatus sets a first area in accordance with the toner density and a second area in which density is higher than the first area, along a rotating shaft direction in a collected area which is a target of developer collection, and performs control so that a second back contrast in the second area is higher than a first back contrast in the first area in a case of the developer collection.

An image forming apparatus includes an image bearing member, a frame member connected to first and second metal plates supporting the image bearing member, and a motor disposed on the first metal plate and between the first and second metal plates in a rotation-axis direction of the image bearing member. The frame member includes a reinforcing surface formed in an area in the rotation-axis direction in which the motor is not disposed, and when viewed in the rotation-axis direction, the reinforcing surface and the motor partially overlap with each other. A portion of the motor projects from the reinforcing surface toward a direction opposite to the image bearing member. A shield metal plate is connected to the first and second metal plates and the frame member and covers the portion of the motor from a side opposite to the image bearing member.

An image forming apparatus includes a body frame, a drum unit, and an exposure unit. The drum unit is inserted to between a pair of side plates through an opening. The body frame includes a fitted plate. The drum unit is fitted to, in a state positioned with respect to, the fitted plate. The exposure unit is fitted to, in a state positioned with respect to, a stay. One side plate has a through hole. The stay has a positioning protrusion. The fitted plate has a positioning hole. Inserting the positioning projection that projects outward from the one side plate through the through hole into the positioning hole positions the stay and the fitted plate with respect to each other.

In an image forming apparatus, an image forming unit can be replaced. An outer cover becomes in an open status when the image forming unit is replaced. An inner cover becomes in an open status with a manual operation with taking a predetermined time after the outer cover becomes in an open status when the image forming unit is replaced. A cover open/close sensor detects open and close statuses of the outer cover. The image forming unit includes a non-volatile unit memory. Further, the controller (a) performs data communication with the unit memory, and (b) if data communication with the unit memory is ongoing when the cover open/close sensor detects that the outer cover becomes in an open status, completes the data communication and cuts off power supply to the image forming unit before the predetermined time elapses.