A medium transport device 1 includes a transport section 120 configured to transport a medium P; a detection section 101 configured to detect the medium P transported by the transport section 120 via a detection surface 101A; a cleaning section 110 configured to clean the detection surface 101A; a housing 53 configured to house the transport section 120, the detection section 101, and the cleaning section 110; and a door section 6 configured to open and close the housing 53, wherein the cleaning section 110 is configured to slide with respect to the detection surface 101A in conjunction with opening and closing of the door section 6.

A power transmission apparatus includes a drive source, a power transmission switching section configured to switch between a transmission state in which power of the drive source is transmitted to a driven section and a non-transmission state in which power of the drive source is not transmitted to the driven section, a load switching section configured to switch between a first load state, which is a load while the driven section is driven, and a second load state, which is a load smaller than the load of the first load state, and a control section, wherein the control section switches the power transmission switching section from the non-transmission state to the transmission state while the load is in the second load state, and then uses the load switching section to switch the load from the second load state to the first load state.

A printing apparatus including: a housing; a feed roller, disposed in the housing, that feeds a sheet; a printing unit configured to print onto the sheet fed by the feed roller, and a storage cassette capable of being attached to and removed from the housing, the storage cassette storing the sheet, wherein the storage cassette includes a sheet separation unit capable of contacting the feed roller, and the printing apparatus comprises a regulating unit, disposed in the housing, configured to regulate rotation of the feed roller in conjunction with removal of the storage cassette from the housing.

A sheet conveying device includes first and second members and an urging member. The first member is rotatable, displaceable to closed, open and intermediary positions and includes an engaging portion. The second member is rotatable in a different direction of the first member, displaceable to closed and open positions and includes an engaged portion. The urging portion urges to move the first member toward the closed position when in a first range from the closed position to the intermediary position, and to move toward the closed position when in a second range from the intermediary position to the open position. When the first member and the second member are in the closed position, the engaging portion is engaged with the engaged portion, and when the first member is moved from the closed position to the open position, the second member is moved to the open position and retained.

According to an aspect of the present disclosure, there is provided a medium conveyance device including a second conveyance roller pair disposed downstream in a conveyance direction of a first conveyance roller pair and a shutter unit including a contact section with which a leading end of a conveyed medium comes into contact upstream of a nip position of the second conveyance roller pair and displaceable to a first posture for correcting skew of the medium and a second posture for retracting the contact section such that the medium after the correction reaches the nip position, and a third conveyance roller pair disposed between the first conveyance roller pair and the contact section in the first posture. The third conveyance roller pair does not nip the medium before the leading end of the medium comes into contact with the contact section in the first posture of the shutter unit and nips and conveys the medium after the correction and when the shutter unit is displaced from the first posture to the second posture.