A drive transmitting device, which is included in an image forming apparatus, includes a drive source, a drive transmitting body, and a rotary shaft. The drive transmitting body has a press-in target portion. The rotary shaft includes a press-in portion mounted on one end of the rotary shaft in an axial direction of the rotary shaft to be pressed into the press-in target portion of the drive transmitting body. The press-in portion includes a flat face and a plurality of circular arc faces having different distances from an axial center of the rotary shaft and being disposed at a same position as at least a portion of the flat face in the axial direction of the rotary shaft. A radius of curvature of one of the plurality of circular arc faces is greater than a radius of curvature of another of the plurality of circular arc faces.

A winding device includes a winding shaft that rotates and winds a print medium conveyed from a printing device having a conveyance roller that conveys the print medium, a gear, and a motor driving the conveyance roller and the gear. The winding device also includes a power transfer mechanism to connect to the gear and transfer power to the motor, and a lever disposed between the winding shaft and the conveyance roller in a conveyance path in a configuration in which the winding device is connected to the printing device. The lever may be moved between a first position in which the print medium bends and a second position in which the print medium bends at a shallower angle than at the first position.

A multi-feed detection device includes a transmission circuit substrate on which an ultrasonic transmitter transmitting an ultrasonic wave is installed, and an ultrasonic receiver receiving the ultrasonic wave. The ultrasonic transmitter transmits the ultrasonic wave in a direction intersecting a thickness direction of the transmission circuit substrate and at least one of the ultrasonic transmitter and the ultrasonic receiver has a plurality of ultrasonic elements.

Provided is a circulation-type paper sheet storage unit equipped with circulation units in a casing, enabling to swiftly take measures and perform recovery processing on the user side when the circulation unit malfunctions. The paper sheet storage unit includes circulation units (100 and 200) that are accommodated in a casing 60 to receive paper sheets transported into the casing by operating upon reception of a drive force from a motor and feed paper sheets stored therein to outside of the casing. The casing includes guide members 620 that serve as a guide at the time of attaching or detaching the circulation unit with respect to the casing, and the circulation unit includes guided members (655A, 675A, 655B, and 675B) which respectively detachably engage with the guide member, and are guided to an installation completion position along the guide members in an engaged state.

A drive mechanism that drives a rotator to rotate includes a main motor, an assist motor, and processing circuitry. The main motor drives the rotator. The assist motor drives the rotator and assists a drive of the rotator by the main motor. The processing circuitry controls a speed of the main motor so that a rotational speed of the rotator is constant, and controls a motor voltage of the assist motor so that the motor voltage of the assist motor changes according to a change in a motor current of the main motor.

A media processing device includes: a hopper for supporting a stack of media units (e.g. cards), the hopper including (i) a gate wall configured to abut leading edges of the media units and (ii) an outlet defined at an end of the gate wall; a pick roller at the outlet for engaging an outer one of the media units in the stack and dispensing the outer media unit from the hopper to a media processing path; the gate wall including a flexible gate at the outlet, the flexible gate configured to deflect toward the media processing path responsive to the outer media unit being driven into the flexible gate by the pick roller, wherein the outer media unit deflects when passing by the flexible gate, permitting the outer media unit to be dispensed from the hopper.

Examples of stalling of operation of imaging devices are described herein. In an example, the imaging device includes an input roller assembly to transport a medium in the imaging device and a line feed roller assembly disengagably coupled to the input roller assembly to selectively drive the input roller assembly. To stall the operation of the imaging device, a line feed shaft of the line feed roller assembly can be automatically disengaged from the input roller assembly to discontinue advance of the medium along a print path.

A medium feeder includes a feed roller that feeds a medium loaded on a medium loading section; a transport roller disposed downstream relative to the feed roller; a first driving source that drives at least the feed roller; a second driving source that drives at least the transport roller; and a housing that houses the feed roller, the transport roller, the first driving source, and the second driving source, wherein the housing includes a lower unit that constitutes a lower part of the housing, and an upper unit openable relative to the lower unit, and the first driving source and the second driving source are disposed on both sides relative to a center part of the lower unit in a width direction perpendicular to a medium transportation direction.

A sheet processing apparatus includes a first conveyance rotary member, a second conveyance rotary member, a punch member, a sensor, a punch motor, a conveyance motor, a first drive transmission portion including a first number of drive transmission members configured to sequentially transmit driving force of the conveyance motor to the first conveyance rotary member, and a second drive transmission portion including a second number of drive transmission members configured to sequentially transmit driving force of the conveyance motor to the second conveyance rotary member, the second number being larger than the first number.

A drive transmitting device, which is included in an image forming apparatus, includes a drive source, a drive transmitting body, and a rotary shaft. The drive transmitting body has a press-in target portion. The rotary shaft includes a press-in portion mounted on one end of the rotary shaft in an axial direction of the rotary shaft to be pressed into the press-in target portion of the drive transmitting body. The press-in portion includes a flat face and a plurality of circular arc faces having different distances from an axial center of the rotary shaft and being disposed at a same position as at least a portion of the flat face in the axial direction of the rotary shaft. A radius of curvature of one of the plurality of circular arc faces is greater than a radius of curvature of another of the plurality of circular arc faces.