Image forming system, post processing apparatus, sheet feed control method and sheet feed control program

摘要

An image forming system comprises: an image forming apparatus and a post processing apparatus that performs a post process on sheets each carrying thereon an image printed by the image forming apparatus. In the image forming system, a sheet feeder feeds sheets of a job to be post-processed to a post processing position; a timing judger judges which is before/after, the first timing to finish feeding the last sheet of the job to the post processing position, or the second timing to finish making preparation for a post process; a delaying time calculator calculates a post process execution delaying time that is a time difference between the first timing and the second timing; and a sheet feed controller controls sheet feed timing of the top sheet of a following job by using the calculated post process execution delaying time, if the second timing is after the first timing.