There is provided a medium transporting device including: a medium placement section on which a medium is placed, a feeding roller feeding a medium from the medium placement section, a motion detection sensor detects a motion of a medium, and a controller that stops feeding of a medium based on a detection value received from the motion detection sensor, in which the motion detection sensor is a two-dimensional sensor including a light emitting section and a light receiving section and detecting a motion of a medium, the medium placement section is provided with a placement detector that acquires information relating to a presence/absence of a medium on the medium placement section, and the controller sets a state of the light emitting section to a non-light emitting state when detection information of the placement detector indicates that a medium is absent on the medium placement section.

An image forming apparatus includes a first detection unit, a second detection unit, a first conveyance unit, a second conveyance unit, which is provided on downstream in the conveyance direction with respect to the first detection unit and is configured to convey sheets, and a control unit. When the first detection unit does not detect a trailing edge of a first sheet before a first timing, the control unit stops the drive of the first conveyance unit and continues drive of the second conveyance unit, and when the second detection unit detects the trailing edge of the first sheet before a second timing later than the first timing, the control unit re-drives the first conveyance unit or stops the drive of the second conveyance unit in accordance with a sheet length of the first sheet in the conveyance direction.

An image forming apparatus includes a first detection unit, a second detection unit, a first conveyance unit, a second conveyance unit, which is provided on downstream in the conveyance direction with respect to the first detection unit and is configured to convey sheets, and a control unit. When the first detection unit does not detect a trailing edge of a first sheet before a first timing, the control unit stops the drive of the first conveyance unit and continues drive of the second conveyance unit, and when the second detection unit detects the trailing edge of the first sheet before a second timing later than the first timing, the control unit re-drives the first conveyance unit or stops the drive of the second conveyance unit in accordance with a sheet length of the first sheet in the conveyance direction.

A printer includes: a conveyor; a printing device; a full-cut unit provided downstream of the printing device; a roller provided downstream of the full-cut unit; a nip member; a motor; and a controller configured to: control the full-cut unit to fully cut the printing medium; control the motor to establish a state in which a leading printing medium is nipped between the roller and the nip member; and control the conveyor to convey a succeeding printing medium downstream while controlling the printing device to perform printing on the succeeding printing medium.

A printer includes: a conveyor; a printing device; a full-cut unit provided downstream of the printing device; a roller provided downstream of the full-cut unit; a nip member; a motor; and a controller configured to: control the full-cut unit to fully cut the printing medium; control the motor to establish a state in which a leading printing medium is nipped between the roller and the nip member; and control the conveyor to convey a succeeding printing medium downstream while controlling the printing device to perform printing on the succeeding printing medium.

A sheet feeding device includes a sheet loader, a sheet feeder, a misfeeding detector, a memory, and circuitry. The sheet loader is configured to load a sheet of a sheet bundle. The sheet feeder is configured to feed a sheet from the sheet bundle loaded on the sheet loader. The misfeeding detector is configured to detect a misfeeding of the sheet. The memory is configured to store sheet feed information on sheet feeding. The circuitry is configured to change a sheet feed setting based on the sheet feed information stored in the memory and perform a retry sheet feeding at a detection of the misfeeding by the misfeeding detector.

A sheet feeding device includes a conveyance rotator, a separation rotator, a torque applier, a torque control circuit, and a torque transmission switcher. The conveyance rotator conveys a sheet in a sheet feeding direction. The separation rotator sandwiches the sheet together with the conveyance rotator. The torque applier applies a reverse torque to the separation rotator in a sheet reversing direction to reverse the sheet. The torque control circuit controls the reverse torque applied to the separation rotator to be equal to or less than a given value. The torque transmission switcher switches, between a transmission state and a non-transmission state, a state of a torque transmission path between the torque applier and the separation rotator. The transmission state is a state in which the reverse torque is transmitted. The non-transmission state is a state in which the reverse torque is not transmitted.

A sheet stacking apparatus includes an ejector, a stacker, a wall, and an upper surface detector. The ejector ejects a sheet, and the stacker stacks the sheet ejected from the ejector. The wall contacts a trailing end of the sheet ejected from the ejector in an ejection direction to align the sheet. The upper surface detector detects an upper surface on a trailing end side of the sheet stacked on the stacker in the ejection direction. When the sheet moves toward the wall, the upper surface detector moves from a home position in which the upper surface detector detects the upper surface of the sheet to a retracted position in which the upper surface detector does not contact the sheet moving toward the wall.

A sheet discharging apparatus includes a discharge portion including a first member configured to apply a force to a first region of a sheet from an upper surface and a second member configured to apply a force to a second region of the sheet from a lower surface, and a contact portion including a first guide surface disposed contactably with the first region and a second guide surface disposed contactably with the second region. The first guide surface is formed such that an angle with respect to a tangential line at a contact point between the first member and the first region of the sheet becomes a first angle. The second guide surface is formed such that an angle with respect to a tangential line at a contact point between the second member and the second region of the sheet becomes a second angle which is smaller than the first angle.

A sheet discharging apparatus includes a discharge portion including a first member configured to apply a force to a first region of a sheet from an upper surface and a second member configured to apply a force to a second region of the sheet from a lower surface, and a contact portion including a first guide surface disposed contactably with the first region and a second guide surface disposed contactably with the second region. The first guide surface is formed such that an angle with respect to a tangential line at a contact point between the first member and the first region of the sheet becomes a first angle. The second guide surface is formed such that an angle with respect to a tangential line at a contact point between the second member and the second region of the sheet becomes a second angle which is smaller than the first angle.