An electrophotographic color image forming apparatus develops an electrostatic latent image with a developer to form an image and includes a photoconductor and an optical writing device. The writing device includes a light-emitting element, a light emission control element, a deflector element, a synchronization detection element, a memory, and processing circuitry. The memory stores a first light amount of the light-emitting element when a color shift is corrected. The processing circuitry corrects the color shift by adjusting a write start timing, and corrects a detection shift generated when a light amount of light incident on the synchronization detection element fluctuates. The processing circuitry calculates a detection shift correction value of the detection shift of the synchronization detection element, using the first light amount and a second light amount determined as a lighting condition of the light-emitting element, and adds the detection shift correction value to a color shift correction value.

An image forming apparatus includes a discharging portion to discharge a sheet on which the image has been formed, an image reading portion to read the image formed on the sheet, and a switching portion to switch between a first position where the discharged sheet is conveyed to a supporting portion and a second position where the discharged sheet is conveyed toward the image reading portion. The sheet conveyed toward the image reading portion is conveyed to a reading position after conveyance of the sheet by the discharging portion is finished, and the control portion conveys the sheet at a first conveyance speed in a period before a trailing end of the sheet is released from the discharging portion and conveys the sheet at a second conveyance speed different from the first conveyance speed in a period after the trailing end of the sheet is released from the discharging portion.

There is provided a liquid jetting apparatus including a conveyor, a liquid jet head, a carriage, a carriage moving device, and a controller. The controller carries out printing by repeating a scan-printing operation and a conveyance operation, and carries out a process of determining a jet-timing such that the jet-timing and a predetermined reference timing may deviate oppositely from each other between a print area on the upstream side and a print area on the downstream side along a scanning direction for the carriage to move in the scan-printing operation with respect to a predetermined reference position in the scanning direction, based on a value of a correction parameter. The correction parameter is set to the same value for nozzles included in an identical one of nozzle groups and to different values for the corresponding nozzles included in different ones of the nozzle groups.

Provided is an image forming apparatus including an intermediate transfer body; a secondary transfer section; a conveyance section; a first detection section; a second detection section that is arranged downstream of the first detection section in a conveyance direction of a medium; and a control section that performs control for changing a conveyance speed of the medium by the conveyance section to a first speed based on timing of detection of the medium by the first detection section and a position of the image on the intermediate transfer body at that time point and changing the conveyance speed of the medium by the conveyance section to a second speed equal to the traveling speed of the intermediate transfer body based on timing of detection of the medium by the second detection section and the position of the image on the intermediate transfer body at that time point.

An image forming apparatus includes a conveying unit, an image forming unit, a fixing unit, a first driving unit, a second driving unit, a transmission unit to transmit an ultrasonic wave, and a reception unit. Where a determination is made that a timing at which excitation of the first driving unit is switched or a timing at which excitation of the second driving unit is switched overlaps with a timing to obtain a value of the ultrasonic wave received by the reception unit, the transmission unit does not transmit an ultrasonic wave. Where a determination is made that the timing at which the excitation of the first driving unit is switched or the timing at which the excitation of the second driving unit is switched does not overlap with the timing to obtain the value of the received ultrasonic wave, the transmission unit transmits an ultrasonic wave.

An image forming apparatus is connected to a paper processing apparatus and includes an image forming unit, a nip part and a hardware processor. The image forming unit performs image forming on continuous paper being conveyed on a conveyance path. The nip part nips the paper on the conveyance path. The processor selectively performs first control and second control according to an output timing of a conveyance control signal if the signal is output from the paper processing apparatus or the image forming apparatus. In the first control, the processor notifies the paper processing apparatus of permission to start or stop conveying the paper after causing the nip part to perform a press-and-contact operation or a separation operation. In the second control, the processor notifies the paper processing apparatus of the permission without causing the nip part to perform either operation.

The image forming apparatus includes an image adjustment unit that performs image adjustment on an image for adjustment formed on a rotary member by an image forming unit, based on the detection result by a detection unit, the image adjustment unit calculates the position of second data corresponding to the detection result by detecting an area in which the image for adjustment is formed, and calculates first data corresponding to the position of the second data corresponding to the detection result by detecting an area in which the image for adjustment is not formed, and performs the image adjustment by using the first data and the second data.

An image forming apparatus including a first sensor configured to output a signal in response to detecting passage of each sheet fed by a sheet feeder, a second sensor configured to output a signal in response to detecting passage of each sheet re-conveyed by a re-conveyance unit, and a controller configured to acquire a passing time period during which a preceding sheet fed by the sheet feeder is passing through the first sensor, based on the signal from the first sensor, determine an adjustment time period between a time when a leading end of the preceding sheet re-conveyed by the re-conveyance unit is detected based on the signal from the second sensor and a time for the sheet feeder to feed a subsequent sheet toward the image forming unit, and control the sheet feeder to feed the subsequent sheet toward the image forming unit with timing adjusted based on the determined adjustment time period.

An information processing apparatus includes a processor configured to, if an image processing operation generating an image to be formed on a paper sheet is not completed until a predetermined period of time elapses, switch transporting a paper sheet to an image former from a first tray to transporting a paper sheet to the image former from a second tray that takes a longer time to transport the paper sheet than the first tray.

A paper feed device includes a plurality of paper feed sections and a selection control section. Selection periods include a specific selection period during which at least two selection signals among a plurality of selection signals are not at a normal level. Non-selection periods include a first normal period, a second normal period, a preceding non-selection period, and a succeeding non-selection period. The preceding non-selection period is between the first normal period and the specific selection period. A specific selection signal among the at least two selection signals is switched from the normal level to a selection level during the preceding non-selection period. The succeeding non-selection period is between the specific selection period and the second normal period. The specific selection signal is switched from the selection level to the normal level during the succeeding non-selection period.