A printer has a carriage being movable between a first end and a second end of a reciprocating path; and a driving force transmitting path selecting mechanism provided at the second end of the reciprocating path. The selecting mechanism has: a common driving force outputting member; a plurality of force receiving members; a selecting member; and a position retainer for keeping the position of the selecting member. The selecting member connects the force outputting member to one of the plurality of force receiving members, and moves in association with the carriage when the carriage moves in a vicinity of the second end in a first direction extending from the first end to the second end. The position retainer keeps the position of the selecting member when the carriage moves in a second direction extending from the second end to the first end. The force receiving member connected to the force outputting member via the selecting member is selected in accordance with a movement of the carriage along the reciprocating path.

When an abutting member is in contact with a driving force transmission member that engages with a driving member, a biasing member biases the driving force transmission member in a direction where the driving force transmission member is disengaged from the driving member.

When an abutting member is in contact with a driving force transmission member that engages with a driving member, a biasing member biases the driving force transmission member in a direction where the driving force transmission member is disengaged from the driving member.

A printer includes a platen roller conveying a label sheet, a first motor rotating the roller, a print head facing the roller and printing on a label of the sheet, a discharge port, a winding roller for winding the sheet from which the label has been detached, a second motor rotating the winding roller, a drive train by which a rotational force can be transmitted from the second motor to the winding roller, and a processor controlling the motors to rotate in a first direction to convey the sheet in a forward direction and controlling the head to print on a first label of the sheet, and after the label is discharged, controlling the motors to rotate in a second direction opposite to the first direction. The drive train disengages the winding roller from the second motor when the second motor is controlled to rotate in the second direction.

A printer includes a platen roller conveying a label sheet, a first motor rotating the roller, a print head facing the roller and printing on a label of the sheet, a discharge port, a winding roller for winding the sheet from which the label has been detached, a second motor rotating the winding roller, a drive train by which a rotational force can be transmitted from the second motor to the winding roller, and a processor controlling the motors to rotate in a first direction to convey the sheet in a forward direction and controlling the head to print on a first label of the sheet, and after the label is discharged, controlling the motors to rotate in a second direction opposite to the first direction. The drive train disengages the winding roller from the second motor when the second motor is controlled to rotate in the second direction.

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.