An image forming apparatus includes a controller to execute a first mode for forming a toner image on a recording medium, in which a maximum toner carrying amount per unit area is a first maximum toner carrying amount, and a second mode for forming a toner image on the recording medium, in which the maximum toner carrying amount per unit is a second maximum toner carrying amount larger than the first maximum toner carrying amount. In the first mode, the controller sets a circumferential speed ratio of the toner bearing member against an image bearing member at a first circumferential speed ratio, and in the second mode the controller sets the circumferential speed ratio at a second circumferential speed ratio higher than the first circumferential speed ratio. The controller executes the second mode upon an order of the second mode by an operator.

An image forming apparatus includes a scanner, a printer configured to print an image based on an image read by the scanner, a memory, and a processor. The memory stores a setting value for adjusting positioning of an image to be printed by the printer on a sheet of a sheet size, and sheet size information specifying the sheet size corresponding to the setting value. The processor is configured to acquire, as a readjustment sheet size, a size of a sheet used for readjustment of the setting value upon receiving an instruction to perform the readjustment, and update the setting value stored in the memory based on a difference between the sheet size indicated by the sheet size information and the readjustment sheet size.

An image forming apparatus includes a storing unit that stores information associated with a sheet type of a sheet and a sheet feed source, of a plurality of sheet feed sources, a selection unit that selects a sheet feed source from the plurality of sheet feeding sources based on at least a sheet type designated by a job and the stored information, and a feeding unit that feeds a sheet from the selected sheet feed source. The image forming apparatus also includes an image forming unit that forms an image on the sheet fed by the feeding unit, and a detector that detects a sheet type of the sheet fed from one of the plurality of sheet feed sources by the feeding unit. The storing unit stores the sheet type detected by the detector as the information indicating the sheet type of sheet stored in the sheet feeding source.

An image forming apparatus according to one or more embodiments includes a fixing device and a controller. The fixing device includes a first heating source and a second heating source. The second heating source has a heating width greater than that of the first heating source. The first and second heating sources have different heating characteristics in response to temperature increases. The controller selects one of the first heating source and the second heating source according to a size of a sheet on which printing is to be performed.

Provided is an image forming apparatus including a printer controller configured to form an image on a sheet, a storage unit configured to store a plurality of adjustment conditions for adjusting a position on the sheet at which the image is to be formed, and a CPU. The CPU selects one of the plurality of adjustment conditions, adjusts the position at which the image is to be formed based on the selected adjustment condition, and causes the printer controller to form the image on the sheet.

The image forming apparatus includes: a paper feed unit; a print unit; a registration roller; a sheet leading end sensor provided downstream, in a transport direction of the recording paper, of the registration roller; a time measuring unit for measuring a time from a start point of transportation of the recording paper by the registration roller to a point of detection of the leading end of the recording paper by the sheet leading end sensor; a memory unit for storing a reference image forming time and a reference time; a print control unit; and an arithmetic unit for obtaining a difference between the reference time and the time detected by the time measuring unit. The print control unit adjusts the length of the image forming period in accordance with the adjusted image forming time determined based on the difference obtained by the arithmetic unit and the reference image forming time.

An image forming apparatus forms an image designated by a job on a sheet fed from one of a plurality of paper feed sources. A detection unit detects paper types of sheets respectively fed from the plurality of paper feed sources, and is provided on a conveyance path. A memory device stores a set of instructions, and at least one processor executes the instructions to function as a first holding unit to hold paper sizes and paper types set by a user in one-to-one correspondence with the plurality of paper feed sources, a second holding unit to hold the paper types detected by the detection unit in one-to-one correspondence with the plurality of paper feed sources, and a third holding unit to hold a paper size designated by the job and a paper type designated by the job or a condition related to setting of a paper type.

A sheet stacking unit of the disclosure includes a sheet stacking plate, a cursor, and a detection sensor. The cursor includes an alignment part for performing widthwise alignment of a document, and a rack extending along the widthwise direction. The detection sensor is placed opposite the rack, and has a light-emitting portion and a light-receiving portion. A plurality of detection-object parts placed in the rack along the widthwise direction have optical characteristics of different reflectivities or transmissivities from one another with respect to light emitted from the light-emitting portion. The controller detects a widthwise size of the document on a basis of output values from the detection sensor which detects light reflected or transmitted by the detection-object parts.

Disclosed is an image forming apparatus, which may include: an image forming part that may form an image on a sheet; a sheet conveying part that may convey the sheet to the image forming part; a sheet length measuring part that may measure a length of the sheet on the basis of a passing timing of a tip end and a rear end of the sheet conveyed to a sheet conveying path; and a hardware processor that may perform control of aligning a formation position in a sheet conveying direction of the image between a first surface and a second surface of the sheet on the basis of a measurement result by the sheet length measuring part.

A sheet characteristic detection device includes: a detector that is disposed on a sheet ejection path through which a sheet is ejected and that detects an electrical resistance value of the sheet; and a charge neutralizer that is disposed on a downstream side of the detector on the sheet ejection path and that neutralizes electric charge on the sheet.