A sheet conveyance device includes a first conveyance member, and a drive transmission mechanism. The first conveyance member is configured to convey a sheet toward a second conveyance member. The drive transmission mechanism is configured to transmit a driving force of a driving source to the first conveyance member. The drive transmission mechanism includes a first drive transmitter and a second drive transmitter disposed coaxially with the first drive transmitter. The driving force is transmitted from the first drive transmitter to the second drive transmitter. The second drive transmitter is rotatable relative to the first drive transmitter within at least a predetermined angular range.

A sheet feeding device includes a tray, a feeding member, a conveying member, a separation member, a transmission unit, and a biasing member. The separation member abuts the conveying member and separates a single sheet from sheets fed by the feeding member. The transmission unit includes first and second portions respectively having first and second transmission surfaces. Where the first and second transmission surfaces abut each other, the first portion drives the second portion that drives the feeding member. The biasing member biases either of the first and second portions so that the first and second transmission surfaces move away from each other. The conveying member is driven in a state where the separation member abuts the conveying member and the feeding member abuts the sheet stacked on the tray and is stopped. Thereafter, the first and second transmission surfaces abut each other, and the feeding member is driven.

A sheet conveyer having a sheet tray, a tray-driving mechanism, a conveyance guide, a feed roller, a separator, a conveyer, a conveyer-driving mechanism, a controller, and a sheet sensor to detect sheets on the sheet tray, is provided. The conveyer-driving mechanism includes a transmission-active portion and a transmission-passive portion. A conveying velocity to convey the sheets by the conveyer is higher than a conveying velocity to convey the sheets by the feed roller and the separator. The transmission-active portion and the transmission-passive portion are rotatable about a transmission axis. The transmission-passive portion rotates passively by being pushed by the transmission-active portion. After the sheet sensor detects absence of the sheets, and before the transmission-passive portion starts rotating passively, the controller conducts a specific action to move the sheet tray downward by controlling the tray-driving mechanism.

A dispensing system includes a roll comprising a keyed end, a dispenser comprising a housing for receiving the roll, and a mount comprising a roll holder to support the keyed end and a roll support to support an opposing end. The roll holder comprises a frame, a clutch plate, a spindle, and a biasing unit, the clutch plate being disposed adjacent the spindle, and the spindle receives the keyed end and is rotatably coupled to the frame to permit rotation of the roll and the clutch plate about the dispensing axis. The spindle comprises a clutch surface and translates along the dispensing axis, and the biasing unit biases the spindle along the dispensing axis away from the frame. Mounting the keyed end of the roll onto the mount pushes the spindle towards the frame to increase a normal force between the clutch plate and the clutch surface.

A paper feeding mechanism includes a feeding path, a driving motor, a bidirectional transmission mechanism, at least one feeding roller, a unidirectional transmission mechanism and at least one blocking roller. The driving motor is controllable to output a driving force towards a forward direction or a driving force towards a reverse direction. The bidirectional transmission mechanism is connected to the driving motor. The at least one feeding roller is mounted in the feeding path. The at least one feeding roller is connected to the bidirectional transmission mechanism. The unidirectional transmission mechanism is connected to the driving motor. The at least one blocking roller is mounted in the feeding path. The at least one blocking roller is disposed to a downstream of the at least one feeding roller. The at least one blocking roller is connected to the unidirectional transmission mechanism.

A thick document conveying device includes a paper pickup mechanism. The paper pickup mechanism has a pick roller base, a pick roller axle, a pick roller, a switching assembly, a first universal coupling, a driving mechanism, a second universal coupling, a bearing and a gear. The pick roller axle and the pick roller are located in the pick roller base. The switching assembly is located under the pick roller base. The first universal coupling is connected to the pick roller axle. The driving mechanism is sleeved on the first universal coupling. The second universal coupling is connected to the driving mechanism. The bearing is connected to the driving mechanism. The gear is connected to the bearing. As described above, both a thick document and a thin document can be adapted.

A recording device includes a first transportation path along which a medium is transported, a recording unit configured to record on the medium on the first transportation path, a second transportation path branching from the first transportation path, a flap located at the junction and configured to be moved to a first position to open the first transportation path and to a second position to close the first transportation path, and a driving section. After the medium passes the junction, the flap is positioned at the second position to come in contact with the medium traveling upstream along the first transportation path and guide the medium to the second transportation path. The flap is moved to the first position by a driving force of the driving section.

A paper feeding mechanism includes a feeding path, a driving motor, a bidirectional transmission mechanism, at least one feeding roller, a unidirectional transmission mechanism and at least one blocking roller. The driving motor is controllable to output a driving force towards a forward direction or a driving force towards a reverse direction. The bidirectional transmission mechanism is connected to the driving motor. The at least one feeding roller is mounted in the feeding path. The at least one feeding roller is connected to the bidirectional transmission mechanism. The unidirectional transmission mechanism is connected to the driving motor. The at least one blocking roller is mounted in the feeding path. The at least one blocking roller is disposed to a downstream of the at least one feeding roller. The at least one blocking roller is connected to the unidirectional transmission mechanism.

A groove has a first side surface and a second side surface. The second side surface faces the first side surface and is located downstream of the first side surface in a first direction. The first side surface has a first contact surface configured to contact one side surface of a protrusion. The second side surface having a second contact surface and a guide surface. The second contact surface is smaller than the first contact surface. The second contact surface is configured to contact an other side surface of the protrusion. The guide surface is inclined away from the first contact surface in a direction from a tip-side end of the second contact surface toward a tip end of a drive shaft. The tip-side end is an end facing toward the tip end of the drive shaft. The guide surface is configured to guide the protrusion to the groove.

A driving force transmission device includes a rotating body that is rotated by receiving a driving force, a control unit that controls rotation of the other rotating part by being switched between a connection state where the control unit is connected to the other rotating part and a separation state where the control unit is separated from the other rotating part as states of the control unit with respect to the other rotating part, and an operation unit that is operated by receiving a force output from the rotating body and includes a contact mechanism to be in contact with the control unit, the contact mechanism being moved by the force output from the rotating body to operate the control unit and the contact mechanism then being separated from the control unit.