Image forming system and relay conveyance apparatus

A relay conveyance apparatus disposed between an image forming apparatus forming an image on a sheet and a post-processing apparatus performing a post-processing on the sheet, the relay conveyance apparatus comprising:

• a casing having an inner space;
• a relay conveyance path formed in the inner space, along which the sheet is conveyed from the image forming apparatus to the post-processing apparatus;
• an opening formed in a side plate of the casing, and through which the inner space of the casing is exposed;
• a cover which opens and closes the opening;
• a conveyance guide switchable between a path formation position where the relay conveyance path is formed and a path opening position where the relay conveyance path is opened;
• a protruding part provided in the cover such that when the conveyance guide is switched to the path formation position, the protruding part is inserted into the inner space of the casing to allow closing of the cover, and when the conveyance guide is switched to the path opening position, the protruding part interferes with the conveyance guide to inhibit from being inserted into the inner space of the casing and to restrict the closing of the cover;
• and
• a cooling mechanism which cools the relay conveyance path, wherein
• the cooling mechanism includes:
• a main duct provided in the cover and through which cooling air is passed;
• a fan which feeds the cooling air to the main duct;
• and
• an air blowing port provided in the protruding part, and through which the cooling air is blown from the main duct to the relay conveyance path.