Patent ID: 8371578

Claim:
A sheet processing system including a first sheet processing apparatus and a second sheet processing apparatus connected to the first sheet processing apparatus downstream of the first sheet processing apparatus in a sheet conveying direction, wherein the first sheet processing apparatus comprises: a first detection unit configured to detect a first positional error of a first sheet conveyed into the first sheet processing apparatus; and a correction unit configured to correct a position of the first sheet, and wherein the second sheet processing apparatus comprises: a second detection unit configured to detect a second positional error of the first sheet that is conveyed into the second sheet processing apparatus after the first positional error has been corrected by said correction unit; and a transmission unit configured to send the second positional error detected by said second detection unit to the first sheet processing apparatus, and wherein the first sheet processing apparatus further comprises: a reception unit configured to receive the second positional error sent from said transmission unit of the second sheet processing apparatus, and wherein said correction unit is further configured to correct a position of a second sheet following the first sheet based on both a first positional error of the second sheet detected by said first detection unit and the second positional error of the first sheet received by said reception unit.