An image forming apparatus includes at least one conveyance roller pair, an image forming unit, at least one brushless motor, a motor drive control unit, a delay amount detector, and an image formation control unit. The image formation control unit controls the motor drive control unit to convey the sheets at a predetermined timing toward the image forming unit. The image formation control unit, during a continuous image formation in which a plurality of sheets are continuously conveyed by the conveyance roller pair with a predetermined sheet spacing and images are sequentially formed on the respective sheets, controls the motor drive control unit to sequentially perform an on and off control of the brushless motor corresponding to the respective sheets, and adjusts the sheet spacing and a rise time in the on control of the brushless motor corresponding to the rotation delay amount detected by the delay amount detector.

A medium conveying apparatus includes a plurality of feed rollers spaced in a direction perpendicular to a medium conveying direction, each of the feed rollers rotating independently at a respective speed to feed a medium, a plurality of brake rollers, each of the plurality of brake rollers being located to face a corresponding one of the plurality of feed rollers, a plurality of torque limiters separately provided between one of rotation shafts of the plurality of brake rollers and a corresponding one of the plurality of brake rollers, and a processor to detect a skew of the medium, and correct the skew of the medium by changing the speed of one of the plurality of feed rollers when the skew of the medium is detected.

Provided is a conveyance state determination system including a controller. The controller acquires actual state information corresponding to a speed change of a sheet on a conveyance path of the sheet based on detection results of a plurality of sheet detection sensors disposed on the conveyance path. The controller acquires reference state information to be compared with the actual state information. The controller compares the actual state information and the reference state information to output evaluation information for evaluating a state of a conveyance device that conveys the sheet through the conveyance path.

An image forming apparatus according to the present disclosure includes: a conveyer; an eye mark detector disposed in a conveyance path and detecting an eye mark formed on a sheet in advance; an image former forming an overprint image at a predetermined position on the sheet with reference to a position of the eye mark on the sheet; and a speed detector including a speed detection roller to be brought into contact with the sheet and detecting a conveyance speed of the sheet. The eye mark detector is disposed at a position separated by an integral multiple of a roller circumferential length of a driving roller and also by a non-integral multiple of a roller circumferential length of the roller from a position at which the image former forms the overprint image on the sheet.

In a case where a type of a feeding standby sheet on a storage unit and a type of a refeeding standby sheet on a reconveyance path are the same, an image forming unit forms an image on one side of a feeding standby sheet on the storage unit, and in a case where a type of a feeding standby sheet on the storage unit and a type of a refeeding standby sheet on the reconveyance path are not the same, the image forming unit forms an image on another side of a refeeding standby sheet on the reconveyance path.

A sheet conveying device includes a sheet supply portion, a detection portion, an acquisition processing portion, and a determination processing portion. The sheet supply portion supplies an uppermost sheet in a stack of sheets lifted by a lift portion to a conveying path. The detection portion detects the sheet supplied by the sheet supply portion on the conveying path. The acquisition processing portion acquires, when the stack of sheets is lifted by the lift portion, speed information related to a conveying speed of the sheet by the sheet supply portion using the detection portion. The determination processing portion determines whether or not the stack of sheets is in a setting failure state based on the speed information acquired by the acquisition processing portion.

A sheet conveying device includes a sheet supply portion, a first acquisition processing portion, a measurement processing portion, and a second acquisition processing portion. The sheet supply portion includes a conveying member which rotates while being in contact with an upper surface of a stack of sheets lifted by a lift portion, and supplies a sheet in contact with the conveying member. The first acquisition processing portion acquires speed information regarding a conveying speed of the sheet. The measurement processing portion measures an elapsed time from a start of supply of the sheet by the sheet supply portion to when the sheet is detected by a detection portion after the conveying member is rotated by a reference amount. The second acquisition processing portion acquires a conveying amount of the sheet when the conveying member is rotated by the reference amount based on the acquired speed information and the elapsed time.

An image forming apparatus includes the following. A medium oscillating mechanism oscillates the recording medium. A medium sensing section senses a position of an end of the recording medium. A belt correction mechanism is configured to correct a position of a belt. A belt sensing section senses the position of the end of the belt. A hardware processor performs first rectification control in which the medium oscillating mechanism rectifies the position of the end of the recording medium based on sensing by the medium sensing section, and second rectification control in which the belt correction mechanism rectifies the position of the end of the belt based on sensing by the belt sensing section. The hardware processor performs a correction to the second rectification control in a case in which the first rectification control is performed with the recording medium straddling both the medium oscillating mechanism and the belt.