An image forming apparatus includes: a fixer including fixing rotation body and pressing rotation body with a fixing nip therebetween, and heats and presses a fed sheet through the fixing nip to fix a toner image on the sheet to the sheet; and a hardware processor making a velocity difference between respective surface velocities of the fixing rotation body and the sheet passing through the fixing nip during a high-gloss mode operation to adjust a gloss of the toner image on the sheet. The hardware processor performs a control so that an absolute value of a velocity difference between respective surface velocities of the fixing rotation body and the pressing rotation body in press-contact when the sheet does not pass through the fixing nip is less than one between respective surface velocities of the fixing rotation body and the sheet when the sheet passes through the fixing nip during the high-gloss mode operation.

An image forming apparatus includes an image bearing member and transfer and control units. The transfer unit and image bearing member form a nip portion where a recording material receives a toner image. The control unit controls image formation based on a timing when a recording material leading edge is detected. To perform sheet conveyance, the control unit changes a first recording material conveyance speed to a second speed before a fed first recording material leading edge is detected. Before the first recording material leading edge reaches the nip portion, the control unit changes the first recording material conveyance speed to a first speed, slower than the second speed, based on when the fed first recording material leading edge is detected. The control unit obtains a timing for the image formation to the image bearing member based on when the conveyance speed is changed from the faster to slower speed.

An image forming apparatus including: a cyclone which centrifugally separates toner from air containing the toner scattered; a storage which stores the toner separated by the cyclone; a filtering portion which allows air to pass, the air being obtained after the toner is separated by the cyclone; a duct which guides the air that passes through the filtering portion; a fan which generates a flow of the air to discharge the air that passes through the filtering portion; and a hardware processor which measures a rotational speed of the fan, detects a full state in which the storage is filled with the toner based on change of the rotational speed of the fan, and issues a warning in a case in which a variation rate of rotational speeds of the fan measured a plurality of times is a predetermined value or more.

An image forming apparatus including a photoconductor and a light emitting unit further includes a generating unit configured to generate correction data used for correcting a shift in the sub-scanning direction of a latent image to be formed on the photoconductor; a correcting unit configured to correct image data based on the correction data; and a control unit configured to control light emission of the light emitting unit so as to form the latent image on the photoconductor. The generating unit is configured to generate the correction data based on configuration information of the light emitting unit, information indicating time required for causing a plurality of light emitting elements to emit light, and information indicating a rotation speed of the photoconductor.

An image forming apparatus including: a photoreceptor drum; an intermediate transfer belt; a primary transferer; a secondary transferer, and a hardware processor which suppresses speed change of the intermediate transfer belt at a timing of the sheet entering the secondary transferer and at a timing of the sheet being ejected from the secondary transferer, wherein the hardware processor calculates speed changes of the intermediate transfer belt and the photoreceptor drum at the timing of the sheet entering the secondary transferer and at the timing of the sheet being ejected from the secondary transferer, and calculates a transmission rate between the intermediate transfer belt and the photoreceptor drum based on the calculated speed changes, and the hardware processor adjusts an operation amount of the driving roller based on the calculated transmission rate.

The image forming apparatus includes a control unit for converting image information into an image signal and output the image signal with reference to a timing signal, a sheet feeding control unit for feeding a recording material, an image forming unit for forming the image on a photosensitive drum based on the image signal output from the control unit, a transmission unit for transmitting a length of the image corresponding to a length of an output period of the image signal, an automatic sheet length detection mechanism for acquiring a length of the recording material in a conveyance direction thereof, and an image control unit for controlling a time interval at which the timing signal is output based on the size of the image and the size of the recording material.

In examples provided herein, a roller damper comprises a damper body element having mass and having a shape to fit an interior of a tubular roller element. The roller element is associated with a natural frequency. The roller damper also comprises an elastomer support member coupled to the damper body element. The mass of the damper body element and the elastomer support member are selected based on the natural frequency of the tubular roller element.

An image forming apparatus includes: a transporter including a gripper to grip a recording medium; an image former that forms a developer image on a transfer body; a transferrer that transfers the developer image to the recording medium by bringing the transfer body with the developer image formed into contact with a transfer cylinder having space to store the gripper; and a processor configured to: correct a density of the developer image formed in the image former, using information related to speed variation of the transfer body when the developer image is transferred to the recording medium, so that density unevenness in an image formed on the recording medium is reduced.

An image forming apparatus includes a rotatable photosensitive member, a charging member, a developing device, a blade, a detecting portion, and a controller. The controller causes the photosensitive member to rotate through one full circumference or more on the following conditions during a predetermined operation: (i) a voltage which is a discharge start voltage or more is applied to the charging member, and (ii) an operation condition of the developing device is a first condition on which an amount of fog toner deposited from the developer carrying member on the photosensitive member is less than an amount of the fog toner in a second condition which is an operation condition of the developing device during a sheet interval before the image formation during the continuous image formation is interrupted.

An image forming apparatus includes an image forming portion configured to form an image on a recording material; a fixing portion including a first rotatable member and a second rotatable member rotatable by rotation of the first rotatable member in contact with the first rotatable member and configured to fix the image on the recording material by heating the image while nipping and feeding the recording material on which the image is formed, at a nip formed between the first rotatable member and the second rotatable member; a motor configured to drive the first rotatable member; a torque detecting portion configured to detect a driving torque of the motor; and a controller. On the basis of the driving torque detected by the torque detecting means, the controller controls a degree of temperature rise of the first rotatable member immediately before the recording material enters the nip.