SHEET ALIGNMENT DEVICE, AND SHEET POST-PROCESSING DEVICE EQUIPPED WITH THE SAME

PROBLEM TO BE SOLVED: To provide a sheet alignment device that can perform alignment of papers to be conveyed in a conveyance direction by a simple configuration.SOLUTION: A paper bundle in which papers S1 to S3 are dislocated in a conveyance direction are stacked is conveyed toward a stopper 53 by a roller pair 50. In the state where a front end 4 of the paper S1 contacts the stopper 53, a protrusion 513 of a roller 501 is engaged with a rear end 5 of the paper S1 immediately after passing a nip 503 of the roller pair 50. Because the shortest distance β between the roller 501 and the stopper 53 and the length P of the paper S in a conveyance direction are in the relationship of β