An image forming apparatus includes a latent image bearer, a charger, a blower, a first detector, and a second detector. The charger charges a surface of the latent image bearer. The blower sends air to around the charger. The first detector detects a temperature of the air to be sent to around the charger. The second detector detects a temperature around the charger. The blower performs an operation based on a detection result of the first detector and a detection result of the second detector.

A charging device includes a charging member, a cleaning member, and first and second support members. The charging member rotates around a rotation shaft and charges of an image holding member. The rotation shaft of the charging member is disposed parallel to a rotation shaft of the image holding member. The cleaning member rotates around a rotation shaft and cleans the charging member. The rotation shaft of the cleaning member is disposed to incline with respect to the rotation shaft of the charging member. The first support member supports one end of the charging member and one end of the cleaning member. The second support member supports the other end of the charging member and the other end of the cleaning member, has the same configuration as a configuration of the first support member, and is disposed symmetrically with the first support member with the charging member interposed therebetween.

An image forming apparatus includes an image forming unit that forms an image by forming an electrostatic latent image on an image carrier, which is charged by a charging member to which a normal voltage is applied, on the basis of image information and by supplying a developer to the image carrier; an application unit that applies a special alternating-current voltage to the charging member, the special alternating-current voltage at least having an amplitude that is greater than that of an alternating-current voltage that is applied when forming the image; and an instruction unit that instructs the application unit to apply the special alternating-current voltage at a specific time in a period other than an image forming period during which the image forming unit forms the image.

A blower duct includes a path section and multiple suppressing sections. The path section connects an inlet and an outlet and allows air to flow therethrough. The suppressing sections are provided at different locations in the air flowing direction and suppress the flow of the air. The path section at least has an entrance path section and a first bent path section. One of the suppressing sections is a first suppressing section including a blocking portion and openings. The blocking portion is disposed in the first bent path section and blocks the flow of the air. The openings are disposed at different positions in one direction and include a first opening disposed closest to the inlet at a first height position where a height from a reference base surface of the first bent path section is larger than the remaining opening or openings.

An inner resistive film is applied to a conductive substrate. Ductile particles are disposed substantially uniformly throughout the inner resistive film. An outer resistive film is applied to the inner resistive film.

A cleaning roller includes a shaft and an elastic body. The shaft extends in an axial direction where a center axis of the shaft extends. The shaft defines a radial direction and has a circumferential surface. The elastic body is helically wound about the shaft and defines a helical direction. The elastic body has a widthwise dimension in a widthwise direction orthogonal to the helical direction and to the radial direction. The elastic body has a base end portion extending in the helical direction and a distal end portion extending in the helical direction. The base end portion is in contact with the circumferential surface and fixed thereto. The distal end portion has a sharp edge and is positioned farthest from the circumferential surface in the radial direction. The widthwise dimension is gradually reduced from the base end portion to the distal end portion in the radial direction.

An image forming apparatus includes: an image carrier having a first rotation axle, a charging roller having a second rotation axle, a conductive member to contact a surface of the image carrier, a gap size acquisition device, and a gap adjustment device. The charging roller is disposed adjacent to the image carrier in a non-contact manner across a gap to charge the image carrier. The gap size acquisition device acquires a size of the gap. The gap adjustment device adjusts a distance between the first rotation axle and the second rotation axle based on information from the gap size acquisition device to maintain the size of the gap within a predetermined range.

There is provided blowing tube. A plurality of flow control members are provided in portions of a passage space of a passage portion which are positioned at different positions in an airflow direction, and control a flow of air. One of the flow control members is provided as a downstream-most flow control member such that the outlet port is blocked by a multi-hole member having a plurality of air holes. Each of the air holes of the downstream-most flow control member is configured as a through hole such that the opening area of the through hole decreases continuously or in a stepwisely toward the downstream side in an air passing direction.

An electrifier cleaning mechanism includes a cleaning member which makes contact with part of a long discharge member, a ball screw arranged in parallel with a longitudinal direction of the discharge member and rotatably supported, a drive source which rotates the ball screw in both of forward and reverse directions, a holding member which holds the cleaning member and has a screw hole in which a screw part of the ball screw is screwed, and rotation of which in a circumferential direction of the ball screw is regulated, and a pressing member which presses the holding member from a first end side of the discharge member toward a second end side thereof in the longitudinal direction.

An image forming apparatus includes: a charging section configured to charge a surface of an image bearing member; an air-intake duct having an air-supply port, and configured to guide air sucked from an outside to the charging section through the air-supply port; an exhaust duct having an air-intake port, and configured to suck air around the charging section through the air-intake port and eject the air thus sucked. The air-intake duct has a configuration in which air guided to the charging section through the air-supply port flows in a direction orthogonal to a longitudinal direction of the charging section, or flows toward a center of the charging section in the longitudinal direction.