Image forming apparatus, sorting device, and tray unit

An image forming apparatus comprising:

• an image forming section configured to form an image on each of a plurality of recording mediums;
• a discharge device configured to discharge each of the recording mediums;
• a plurality of trays on which the recording mediums discharged by the discharge device are to be stacked;
• at least one guide member configured to guide each of the recording mediums from the discharge device toward a discharge destination tray among the plurality of trays, the discharge destination tray being a tray onto which the recording medium guided by the at least one guide member is to be discharged;
• and
• a controller, wherein
• every time one of the recording mediums is discharged by the discharge device, the controller controls the at least one guide member to change the discharge destination tray,
• the trays are configured such that leading ends of the recording mediums in a discharge direction are superposed on one another,
• at least one of the trays has a length in the discharge direction that is shorter than a length of each of the recording mediums in the discharge direction,
• the at least one guide member includes a plate-like member and a support member pivotably supporting the plate-like member,
• the plate-like member includes a projection at an end of the plate-like member in the discharge direction, the projection projecting in the discharge direction,
• the at least one tray includes a recess at an end of the at least one tray in a direction opposite to the discharge direction, the recess being an indented space in the discharge direction, and
• the plate-like member pivots in a manner that the projection passes through the recess.