Patent ID: 8280299

Claim:
A sheet processing apparatus that is disposed at a location downstream of an image forming apparatus in a sheet conveying direction thereof for performing a post-processing on sheets printed by the image forming apparatus, and includes a plurality of discharge trays and a single door for sealing the discharge trays, the sheet processing apparatus comprising: a receiving unit configured to receive a signal from a sensor indicating opening of the single door through which the printed sheets are discharged; a control unit configured to control the sheet processing apparatus to switch from a first operation mode to a second operation mode in response to the receiving unit receiving the signal from the sensor indicating opening of the single door; at least one electric motor that operates during the post-processing on the printed sheets, wherein the sheet processing apparatus operates the at least one electric motor to draw less current in the second operation mode than in the first operation mode to perform the post-processing on the printed sheets quieter in the second operation mode than in the first operation mode.