Image forming system

An image forming system comprising:

• an image forming apparatus that forms an image on a sheet;
• one or more sheet carrying devices successively disposed on the downstream side of the image forming apparatus;
• and
• a control device that controls the image forming apparatus and the one or more sheet carrying devices based on a job that designates a page configuration containing a page order and sheet types of respective pages, wherein
• each of the sheet carrying devices includes
• a bypass conveyance path along which the sheet output from an upstream device is conveyed toward a downstream device, and
• a sheet tray unit that temporarily stores the sheet output from the upstream device and discharges the stored sheet toward the bypass conveyance path, and
• the control device divides the job into sheet types based on a division condition determined beforehand, and the number of the sheet carrying device or devices disposed on the downstream side of the image forming apparatus, and determines a printing order of the divided sheet types and sheet type or types to be stored in the sheet carrying device or devices.