Patent ID: 7427259

Claim:
A method of forming an image, comprising: forming an image; and folding one of a sheet and a sheet bundle in a sheet processing apparatus, the step of folding comprising, conveying said one of a sheet and a sheet bundle with pressure by a sheet conveying unit toward a sheet position adjusting unit; moving the sheet position adjusting unit to a standby position located downstream of a folding position of a folding member in a sheet conveying direction; releasing the pressure of the sheet conveying unit; adjusting said one of a sheet and a sheet bundle, after the releasing the pressure, from the standby position to the folding position by supporting and moving said one of a sheet and a sheet bundle; advancing the folding member toward a nip part of folding rollers in a direction substantially perpendicular to the sheet conveying direction; putting a fold line in said one of a sheet and a sheet bundle conveyed along a sheet conveying path at the folding position; and folding said one of a sheet and a sheet bundle by pinching a portion of said one of a sheet and a sheet bundle around the fold line at the nip part.