An image forming apparatus includes heating and pressurizing rotary members, and a speed control unit. In a first mixed job to be executed in a first mode and where a first recording material is to be initially conveyed and a second recording material is to be conveyed subsequent to the first recording material, the speed control unit sets a conveyance speed of the first recording material to a second speed based on acquired grammage information and sets a conveyance speed of the second recording material to a first speed based on the acquired grammage information. In a second mix job to be executed in the second mode and where the second recording material is to be conveyed subsequent to the initially conveyed first recording material, the speed control unit sets the conveyance speed of the first and second recording materials to the first speed based on the acquired grammage information.

An image forming apparatus includes: a toner-image fixer that fixes an unfixed toner image on a sheet by conveying the sheet while heating and pressing the sheet at a fixing nip; a pressing force changer that changes a pressing force against the sheet at the fixing nip; and a hardware processor that controls the toner-image fixer and the pressing force changer, in which when a conveying speed of the sheet is changed by controlling the toner-image fixer, the hardware processor causes the conveying speed to change in a state in which the pressing force is decreased by controlling the pressing force changer.

In one embodiment, an image forming apparatus has an image forming device, a discharge port of a recording medium, a conveying device of the recording medium, and a controller. The controller judges a kind of the recording medium and the discharge port that is a conveying destination of the recording medium. The controller controls a conveying speed of the recording medium to be discharged from the discharge port by the conveying device, in accordance with the kind of the recording medium and the conveying destination of the recording medium which have been judged.

An image forming apparatus includes a toner image supporting section and a medium transfer section. The toner image supporting section includes first and second toner image supporting member that support first and second toner images at first and second linear speeds, respectively. The medium transfer section transfers, onto a medium, the first and second toner images respectively supported by the first and second toner image supporting members, to thereby cause the first and second toner images to be superimposed on each other. The following conditional expression (1) is satisfied when the medium transfer section transfers the first and second toner images onto the medium,

(Vd1Vt1)/(Vt1>(Vd2Vt2)/Vt2 (1)

where Vd1 is the first linear speed, Vt1 is a first conveyance speed of the medium, Vd2 is the second linear speed, and Vt2 is a second conveyance speed of the medium.

An image forming system includes an image forming apparatus and a discharging device. The image forming apparatus includes a first rotatable member, a second rotatable member positioned downstream of the first rotatable member, a first driving portion for driving the first and second rotatable members, and a first controller for controlling the first driving portion. The discharging device includes a third rotatable member, a second driving portion for driving the third rotatable member, and a second controller for controlling the second driving portion. The first controller controls a driving speed of the second rotatable member depending on a driving speed of the first rotatable member and feeds the driving speed of the first rotatable member to the second controller. The second controller controls a driving speed of the third rotatable member depending on the driving speed fed from the first controller.

An image forming system includes: an image forming unit that forms a toner image on a sheet; a post-processing unit that performs post-processing to the sheet; a conveying unit that conveys the sheet from the image forming unit to the post-processing unit; a discharge member that is arranged between the image forming unit and the post-processing unit in a sheet conveying direction, and discharges static electricity from the sheet conveyed by the conveying unit; a voltage applying unit that applies to the discharge member a discharge voltage for discharging static electricity from the sheet; and a control unit that accelerates a conveying speed of the sheet when the discharge voltage is applied by the voltage applying unit, and controls the conveying unit to vary acceleration timing for accelerating the conveying speed of the sheet in accordance with a type of the post-processing.

An image forming apparatus comprises an image forming section; a fixing device; an input section; a storage section which stores a target temperature of the fixing device in a case of carrying out the fixing processing and a target temperature of the fixing device in a case of carrying out the erasing processing; and a control section which controls to read out lower one of the target temperature of the fixation and the target temperature of the erasure from the storage section to set the lower one to the target temperature of the fixing device in a case in which the processing information of the fixing processing and the erasing processing is input by the input section and the processing is continuously carried out, and drive the fixing device via the driving section at a driving speed corresponding to each of the fixing processing and the erasing processing.

According to one embodiment, an image forming apparatus of an embodiment includes a sheet supply unit, a printer unit, a sheet transport unit, a fixing unit, a fixing roller driving unit, and a control unit. The control unit controls the fixing roller driving unit so as to decelerate a second linear velocity to a fourth transport velocity and to switch to a third transport velocity when a first control time elapses after the leading edge of a sheet starts to be transported from a registration position, if the sheet is transported at a first linear velocity before transfer. Alternatively, the control unit controls the fixing roller driving unit so as to decelerate the second linear velocity to the fourth transport velocity and to switch to the third transport velocity when a second control time that is shorter than the first control time elapses, if the sheet is accelerated before transfer.

A printing system for cut sheets includes a controller for controlling the printing of image data on the cut sheets and scheduling the cut sheets in a printing order. The cut sheets have a plurality of media types, each media type having a dedicated preferred maximum speed for transporting the cut sheets of said media type along a paper path of the printing system. The controller is configured to schedule the cut sheets for printing taking into account change-over times between changes in media types of the scheduled cut sheets. The controller is further configured to calculate a first total time of printing the cut sheets including the change-over times, to determine a common speed for printing the cut sheets among the plurality of media types, to calculate a second total time of printing the cut sheets at the determined common speed excluding the change-over times, and, if the first total time is smaller than the second total time, to print the cut sheets at the corresponding dedicated preferred maximum speeds including change-over times, and, if the first total time is larger or equal to the second total time, to print the cut sheets at the determined common speed.

A digital printing system includes an intermediate transfer member (ITM), to receive a printing fluid to form an image, a continuous target substrate having opposing first surface and second surface, a light source to illuminate the first surface, and an image sensor to image at least a portion of the light transmitted through the target substrate to the second surface, and a processor. The target substrate configured to engage with the ITM at an engagement point for receiving the image from the ITM, and at the engagement point, the ITM is configured to move at a first velocity and the target substrate is configured to move at a second velocity. The processor is configured to produce a digital image based on the electrical signals, and to estimate, based on the digital image, at least a distortion in the image.