An image forming apparatus includes a corona charger, first and second supporting members for supporting the corona charger on the respective sides of the corona charger with respect to the circumferential direction of a photosensitive member, and first and second urging portions for urging a shield of the corona charger in the first and second supporting members. The first urging portion and the second urging portion urge the shield at non-opposing positions relative to each other with respect to a longitudinal direction of the corona charger. The image forming apparatus enables suppression of charging non-uniformity due to vibration of the corona charger without impairing motion of a grid cleaning member.

Toner contains toner base particles and an organosilicon polymer on the surface of the toner base particles. After a toner image is transferred from an intermediate transfer belt to a transfer material, residual toner on the intermediate transfer belt is collected into a belt cleaning device by a blade. A CPU executes supply control of supplying toner from a developing device toward the blade via a photosensitive drum and via the intermediate transfer belt on the basis of the counter accumulated value that correlates with the amount of organosilicon polymer adhering to the blade.

An image forming apparatus is provided, which is capable of suppressing deterioration in the accuracy of control for switching a motor from forward rotation to reverse rotation in a configuration in which a coupling having play in a rotation direction is interposed in a drive train between the motor and a driven member. The image forming apparatus includes: one motor 92a that rotationally drives a photosensitive drum 26 and a developing sleeve 71; a coupling that is interposed in at least one of a drive train between the motor 92a and the developing sleeve 71 and a drive train between the motor 92a and the photosensitive drum 26 and has play in a rotation direction; and a CPU 53 that controls the motor 92a. The CPU 53 rotates the motor 92a forward at a speed V1 at the time of image formation, stops the motor 92a after the end of the image formation, rotates the motor 92a forward at a speed V2 lower than the speed V1, and then reversely rotates the motor 92a.

An image forming apparatus includes an image bearer, a charger, a developing device, and a transferor. The charger is disposed in contact with the image bearer to charge the image bearer. The developing device supplies toner to the image bearer to form a toner image on the image bearer. The transferor transfers the toner image on the image bearer to a recording medium or an intermediate transferor. The developing device collects transfer residual toner remaining on the image bearer after transfer of the toner image. The toner contains base particles and an external additive. The external additive has a volume average particle diameter of 5 nm or more and 50 nm or less. A content of the external additive is 1.8% by mass or less in the toner.

There is provided a method of producing a blade for cleaning a toner image retainer, the method including: binding an abutting layer that abuts against the toner image retainer and a supporting layer that supports the abutting layer, wherein the maximum value D of a difference between a first loss tangent at 1 Hz and a second loss tangent at 100 Hz of the blade that includes the abutting layer and the supporting layer satisfies the formula: 0.2≤D≤0.7, wherein the maximum value D is a maximum value of a difference between the first loss tangent and the second loss tangent at temperatures within a range of 0° C. to 50° C.

In a case where a cleaning member is located at a cleaning position in attachment of a process cartridge to an image forming apparatus, a stopper located at a first position butts against the process cartridge guided in a direction of attachment by a guide portion such that the process cartridge is disabled from being attached to the image forming apparatus, and in a case where the cleaning member is located at a retraction position in attachment of the process cartridge to the image forming apparatus, a lever portion moves due to a press by a cleaning unit and the stopper moves from the first position to a second position such that the process cartridge is enabled to be attached to the image forming apparatus.

An image forming apparatus includes a first image forming unit, a second image forming unit, and an intake unit. The intake unit includes an intake duct provided at one side relative to the first and the second image forming units in an arrangement direction of the plurality of image forming units and configured to take in air outside the image forming apparatus from an intake port, a first fan configured to take in air from a first communication port, and a second fan configured to take in air from a second communication port. The intake unit branches air taken in from the intake duct to the air taken in from the first communication port by the first fan and the air taken in from the second communication port by the second fan, and blows the air to each of the first image forming unit and the second image forming unit.

An image forming apparatus includes a first air suction port sucking an air containing ozone, a second air suction port sucking an air containing the scattered toner, and a duct unit partitioned into a first duct passing through the air containing ozone and a second duct passing through the air containing toner. The duct includes a first fan generating a first air flow inside the first duct to suck the air from the first air suction port and a second fan generating a second air flow inside the second duct to suck the air from the second air suction port. An ozone filter is detachably provided to both the first and second ducts, disposed straddling the first and second ducts, and filters the ozone contained in the first and second air flows.

An image forming apparatus is capable of suppressing deterioration in accuracy of control for switching a motor from forward to reverse rotation in a configuration in which a coupling having play in a rotation direction is interposed in a drive train between the motor and a driven member. The image forming apparatus includes a motor that rotationally drives a photosensitive drum and a developing sleeve; a coupling interposed in a drive train between the motor and the developing sleeve and/or a drive train between the motor and the photosensitive drum and having play in a rotation direction; and a CPU that controls the motor. The CPU rotates the motor forward at a speed V1 at the time of image formation, stops the motor after the end of the image formation, rotates the motor forward at a speed V2 lower than the speed V1, and then reversely rotates the motor.

A duct for guiding air outside an image forming apparatus to a charging device includes: a first flow passage; a second flow passage bent from the first flow passage and extending in a direction orthogonal to a rotational direction and a rotational axis direction of a photosensitive drum, the second flow passage being provided with an outlet; and a plurality of flow dividing plates provided in the second flow passage, the plurality of flow dividing plates being disposed in parallel along the rotational axis direction and forming a third flow passage between the flow dividing plates adjacent to each other, in which a relationship between a length in the orthogonal direction and a length in the rotational axis direction of the third flow passage is a predetermined relationship.