Patent ID: 8251361

Claim:
A sheet processing device, comprising: a conveying member configured to convey a first, second, and third sheets; a stacking member configured to stack the first, second and third sheets; a controller configured to stack the first, second and third sheets on the stacking member in a state where rear ends of the second and third sheets are shifted nearer to a conveying direction upstream side than a rear end of the first sheet by the stacking member; a first aligning member configured to arranged at the back end side of the stacked first, second, and third sheets on the stacking member; and a second aligning member configured to slide the first, second, third sheets stacked in the state toward the first aligning member, the second aligning member configured to align the first, second, third sheets by striking the rear ends of the second and third sheets against the first aligning member before striking the rear end of the first sheet.