Patent ID: 8104758

Claim:
A sheet finisher comprising: (a) a stacking section having a stacking surface arranged to be tilted, and a stopper located below the stacking surface; (b) a sheet finishing section which post-processes for a sheet bundle that hits the stopper and is stacked on the stacking section; (c) a conveying section which sends two sheets to the stacking section under the condition that the two sheets are shifted each other in a conveyance direction thereof and are superimposed; (d) an input section in which sheet type information for a sheet is inputted; and (e) a controller which adjusts a shift amount between the two sheets so that the sheet on a lower side precedes toward the stopper by a prescribed amount, when a conveyance condition of the conveyance section is changed based on the sheet type information inputted by the input section, and the two sheets are conveyed to the stacking section with the two sheets superimposed.