Sheet post-processing device and sheet post-processing system capable of pivoting flapping member and pressing member by single drive source

A sheet post-processing device comprising:

• a tray;
• a sheet discharge roller pair that discharges a sheet onto the tray;
• a conveyance mechanism that conveys the sheet on the tray in a direction opposite to a direction of sheet discharge of the sheet discharge roller pair to allow a trailing end of the sheet in the direction of sheet discharge to abut against an end of the tray;
• a loading assist mechanism that handles the sheet on the tray;
• a post-processing device that subjects the sheet on the tray to post-processing;
• and
• a control device including a processor, and configured to control action of the loading assist mechanism, when the processor executes a control program,
• the loading assist mechanism comprising:
• a flapping member that is provided above the tray and performs a flapping action of, when the trailing end of the sheet in the direction of sheet discharge moves away from the sheet discharge roller pair and reaches above the tray, flapping the trailing end of the sheet downward to drop the sheet on the tray;
• a pressing member that performs a pressing action of pressing the sheet dropped by the flapping member onto the tray with the trailing end of the sheet abutting against the end of the tray;
• a first power transmission mechanism that pivots the flapping member from a predetermined first ready-to-pivot position to allow the flapping member to perform the flapping action;
• a second power transmission mechanism that pivots the pressing member from a predetermined second ready-to-pivot position to allow the pressing member to perform the pressing action;
• a rotary member that is rotatable in a first direction and a second direction opposite to the first direction, transmits, during rotation in the first direction, power for pivoting the flapping member to the first power transmission mechanism, and transmits, during rotation in the second direction, power for pivoting the pressing member to the second power transmission mechanism;
• and
• a drive source that rotates the rotary member,
• wherein the control device controls the drive source to control an angle of rotation of the rotary member in the first direction and thus control an angle of pivoting of the flapping member from the first ready-to-pivot position, and controls the drive source to control an angle of rotation of the rotary member in the second direction and thus control an angle of pivoting of the pressing member from the second ready-to-pivot position.