Provided is an image forming apparatus including an image carrier, a transfer unit, a driver, a hardware processor, an adjustment mechanism, and a speed detector. The hardware processor sets a command value. The hardware processor performs a constant-torque control based on a constant-speed drive torque detected in a constant-speed control. In the constant-torque control, the hardware processor performs a feedback control to set a reference value to an average speed of the driver during passage of a first sheet and calculate a difference from an average speed during passage of a subsequent sheet so as to derive the command value. The hardware processor determines whether a load torque increase, its factor, and/or its influence exceeds a threshold, and forcibly sets the reference value to a speed detected while a pressure between the transfer unit and the image carrier is reduced by the adjustment mechanism from the pressure during image transfer.

An image forming apparatus includes an image forming unit, an intermediate transfer member, a power source, and a control unit configured to perform a mode to output a test chart which is formed by transferring a plurality of test toner images from the intermediate transfer member to a plurality of sheets of the recording material. In a case where a jam occurred during execution of the mode, the control unit is configured to resume the mode after the jam has been recovered. In a case where the control unit resumes the mode after the jam has occurred during the execution of the mode, the control unit is configured to resume the mode from a first sheet of the plurality of sheets of the recording material regardless of a number of sheets of the recording material not discharged due to the jam.

An apparatus body includes a housing, a drawer, a push-out mechanism, and a positioner. The drawer is attachable to and detachable from the housing. The push-out mechanism pushes out the drawer by a predetermined amount from a setting position at which the drawer is positioned in the housing. The positioner positions the drawer at the setting position in the housing. The positioner includes a fitting hole disposed in one of the housing and the drawer and a positioning pin disposed in the other of the housing and the drawer. The positioning pin positions the drawer at the setting position in the housing in response to fitting of the positioning pin into the fitting hole. The positioning pin and the fitting hole each have a form that releases the fitting in response to pushing out of the drawer by the predetermined amount from the setting position.

An image processing apparatus is configured to transit to a communicable power-saving state in which information exchange is possible through a network while power supply to a part of units of the apparatus is stopped. The apparatus includes a connection detection unit configured to detect a connection state of a network cable; and a power supply control unit configured to control a supply state of a power source according to the connection state of the network cable. When the network cable is changed from a connected state to a disconnected state, the power supply control unit controls the supply state of the power source so as to cause the apparatus to transit to a connection detectable power-saving state in which a power supply range is more limited than that in the communicable power-saving state and in which detection of the connection state of the network cable is possible by the connection detection unit.

An image forming device includes an attachment part to which a toner unit having a fuse that can be molten by being supplied with an electric current is detachably attached, and a control part that applies each of a non-melting conduction signal corresponding to a first current supply state where the fuse is not molten and a melting conduction signal corresponding to a second current supply state where the fuse is molten to the fuse. The control part detects each of whether or not the fuse is molten by applying the non-melting conduction signal and whether or not the fuse is molten by applying the melting conduction signal. The control part determines whether or not the toner unit attached to the attachment part is a specific exchange unit on the basis of a detection result of whether or not the fuse is molten.

A toner cartridge comprises a case body having a side opening, a photosensitive roller disposed in the case body and having an imaginary axis, a transmitting assembly and a cover member. The transmitting assembly has an axial member and two engaging claws. Each engaging claw is rotatable between an opened and a closed positions and has a vertex; when the engaging claw is in the opened position, the vertex is defined with the imaginary axis a maximum distance away that is greater than a distance between any other position on the engaging claw and the imaginary axis. The axial member is insertable into the connecting hole in which the engaging claws in the opened position are accommodatable, and operators can directly mount the cover member on the side opening without closing the engaging claws, so that the procedure for mounting the cover member saves time and is convenient.

An image forming apparatus includes a fixing device having a fixing belt assembly including a heater, a fixing belt, a heater temperature sensor, and a belt temperature sensor, and a pressure roller; a drive current sensor; and a life information acquisition portion. The heater temperature sensor detects the temperature of the heater. The belt temperature sensor detects the temperature of the fixing belt. The pressure roller presses against the fixing belt. The drive current sensor detects a drive current of a drive motor that drives the pressure roller. The life information acquisition portion acquires life information of the fixing belt assembly. A controller selects a failure prediction processing mode based on the detection result of the drive current sensor and selects a driving method based on the detection results of the temperature sensors and the acquisition result of the life information acquisition portion in each mode.

A transmission control apparatus includes a first control board including a first control unit with an input/output port and a first board connector; and a second control board including a second control unit with an input/output port and a second board connector. The first control board is connected to the second control board via a general purpose cable, the general purpose cable is used for transmission of an indication signal as a digital signal controlling a power-supply mode transition and is used for serial communications. Lengths of change periods, during which a logical value of the indication signal is changed and with which transitions among three or more power-supply modes are associated, are preset and stored in the first control unit and the second control unit, respectively. The power-supply mode is transitioned to a specific mode according to the lengths of the change periods of the indication signal.

An image forming apparatus includes a transfer belt, a medium conveyer, a controller, a transfer unit, and a first detector. The medium conveyer conveys a recording medium at a medium conveying speed. The controller sets the medium conveying speed to a first speed corresponding to a belt conveying speed in a first period, to a second speed lower than the first speed in a second period, to a third speed higher than the second speed and different from the first speed in a third period, and to the first speed in a fourth period. The transfer unit transfers the conveyed developer image onto the conveyed recording medium. The first detector performs detection of the recording medium in the first or second period. The controller sets a length of the third period on the basis of a result of the detection performed by the first detector.

A cooling device has: first and second guide rollers disposed in the body of a cooling device on upstream and downstream sides, respectively, as seen in a direction in which a continuous medium is fed, and guiding a cooling belt to move in that direction; and a path selection mechanism allowing selection between a non-abutting transport path which does not cause the continuous medium to abut against the cooling belt and an abutting transport path which causes the continuous medium to abut against the cooling belt.