An image forming apparatus comprises a paper feeding unit which feeds a sheet-shaped recording medium, an image forming unit which forms a toner image on the recording medium fed from the paper feeding unit, a fixing unit which fixes the toner image formed by the image forming unit on the recording medium, a stacking unit which stacks the recording medium on which the toner image is fixed by the fixing unit, a temperature sensor which detects the surface temperature of the recording mediums stacked on the stacking unit and a control unit which determines, according to the printing information of the recording medium, whether or not to feed a new recording medium from the paper feeding unit when the surface temperature of the recording mediums detected by the temperature sensor is above a threshold temperature.

The present disclosure provides an image forming apparatus arranged to be able to reduce sticking of toner on an image bearing member in a configuration in which a part of image bearing members can be separated from an intermediate transfer member. A control portion of the image forming apparatus is configured to execute a first mode to form an image on a recording medium with the first and second image bearing members and a second mode to form an image on a recording medium with the first image bearing member while the second image bearing member being separate from the intermediate transfer member. The control portion execute a rotation process of rotating the second image bearing member temporarily in a duration of the second mode in a case where a detection result of a temperature exceeds a predetermined temperature in the duration of the second mode.

An image forming apparatus includes an image forming station for forming a toner image on a sheet; a heating roller and a pressing roller which form a nip for fixing the toner image on the sheet; a heat absorption roller for absorbing heat by contacting the pressing roller; a moving mechanism for moving the heat absorption roller to and away from the pressing roller; a detector for detecting an abnormal state that heat absorption roller remains contacted the pressing roller; and a controller for controlling an interval between adjacent sheets when image forming operation is continuously carried out for a plurality of sheets, wherein when the detector does not detect the abnormal state, the controller supplies the sheets at a first feeding interval, and when the detector detects the abnormal state, the controller supplies of the sheets at a second feeding interval longer than the first interval.

A media path moves media sheets from a media supply, a print engine receives the media sheets from the media path, and a sensor detects a characteristic related to the media sheets. A drive nip continuously moves the media sheets, and a stall nip receives the media sheets from the drive nip. The stall nip is positioned less than the length of one of the media sheets from the drive nip. The stall nip alternately stops or moves the media sheets while the drive nip continuously moves the media sheets, as controlled by a controller, to cause the media sheets to buckle between the drive nip and the stall nip. The controller controls when to stop or move the media sheets to constantly vary the size of the buckle, and thereby make the buckle relatively larger for a first characteristic and make the buckle relatively smaller for a different characteristic.

An image forming apparatus includes an image forming portion for forming a toner image; an intermediary transfer belt for receiving the toner image; a blade for cleaning the belt by removing residual toner therefrom; an ambient condition sensor for detecting an ambient condition; a memory for storing information relating to a use amount of the belt; and a controller for executing an operation in a mode in which a toner is deposited on the belt in an area corresponding to between a preceding sheet and a succeeding sheet during execution of a continuous image forming job for continuously forming the images on the sheets to supply the toner to the blade. The controller controls a frequency of the operations in the mode, on the basis of an output of the sensor during an image formation job and the information stored in the memory.

An image forming apparatus includes an image former that forms a color image by superimposing images of respective colors formed on respective different photoconductors on an intermediate transfer body, the image former continuously forming color images of pages on one continuous paper, and the image forming apparatus includes: a first hardware processor that performs job management for each color and generates print job data in which a margin region having a first width is set on an upstream or a downstream in a sheet passing direction of an image forming region of each page; a second hardware processor that detects a color shift amount of each color of the image forming region; and a third hardware processor that corrects a formation position of the image forming region to be a print target page next on the print job data for a color in which a color shift has occurred.

A post-processing apparatus includes a post processer, a conveyor, a surface detector, an air blower, and a switch. The post processer performs post processing on a medium. The conveyor conveys the medium. The surface detector detects a surface of the medium. The air blower blows air toward the surface of the medium. The air blower includes an air blowing fan, multiple air blower ports, and an air duct. The air blowing fan generates airflow. The multiple air blower ports blow air to the medium. The air duct couples the air blowing fan and the multiple air blower ports to guide the air from the air blowing fan to each of the air blower ports. The switch controls the amount of the air blown from each of the multiple air blower ports to the medium based on a detection of the surface of the medium by the surface detector.

An image forming system includes a transport unit that transports a recording medium by using a roller; a transfer unit that applies a transfer voltage by using a transfer body and that transfers a toner image to the recording medium that is transported by the transport unit; a fixing unit that fixes the toner image by using a heat roller to the recording medium to which the toner image is transferred; and a processor configured to: implement temperature control on the heat roller, based on a result of detection of an electric current value detector that detects an electric current value of an electric actuator that rotates the roller and a result of detection of a resistance value detector that detects volume resistivity of the recording medium when the toner image is transferred to the recording medium after the electric current value detector detects the electric current value.

An image forming apparatus according to an embodiment includes a first image forming unit that forms an image on a sheet using a decolorable color material for a decolorable image forming job. A second image forming unit forms an image on a sheet using a non-decolorable color material for a non-decolorable image forming job. A heat source heats the sheet at a control temperature according to a job type. A storage unit includes a job queue that registers jobs in a received order. When a plurality of jobs that differ in the control temperature are registered in the job queue, a controller that changes an execution order of the jobs in the job queue into the ascending order of the control temperature of the heat source, and executes the jobs registered in the job queue according to the changed order.

When it is judged that a predetermined operation for eliminating a cause for stopping a job is being executed, a following job is restricted from being executed prior to a stopped job. A control method for controlling a job processing apparatus for storing received jobs in a storage unit and sequentially executing the stored jobs includes determining, when a cause for stopping the job to be executed is generated, whether a state in which the cause for stopping the job is not eliminated has continued for a predetermined time, executing, when it is determined that the state in which the cause for stopping the job is not eliminated has continued for the predetermined time, a following job that follows the job is executed prior to the job, judging whether a predetermined operation for eliminating the cause for stopping the job is being executed, and restricting, when it is judged that a predetermined operation for eliminating the cause for stopping the job is being executed, the following job is restricted from being executed prior to the job.