Sheet conveyance apparatus and image forming apparatus

A sheet conveyance apparatus comprising:

• a conveyance section configured to convey a sheet, the conveyance section including a roller rotatable in a first rotation direction and a second rotation direction opposite to the first rotation direction;
• a guide member configured to guide the sheet and to move between a first position and a second position different from the first position;
• a drive source;
• a drive switching unit including an input unit to which a driving force is input from the drive source, an output unit configured to output the driving force to the roller, and a switching unit, the switching unit, in a first state, outputting the driving force transmitted from the input unit to the output unit such that the roller rotates in the second rotation direction, the switching unit, in a second state different from the first state, outputting the driving force transmitted from the input unit to the output unit such that the roller rotates in the first rotation direction;
• and
• a drive interruption unit configured to transition between a transmission state in which the driving force transmitted from the switching unit is transmitted to the guide member and a non-transmission state in which the driving force is not transmitted to the guide member,
• wherein the roller is configured to rotate by the driving force output from the output unit of the drive switching unit while the guide member moves between the first position and the second position, and
• wherein the switching unit is configured to transition between the first state and the second state based on a transition of a state of the drive interruption unit between the transmission state and the non-transmission state.